Data supplied from the Rothamsted Meteorological Station (Harpenden)
Change of rain gauge and the effect on rainfall capture and data presented in Monthly Weather Summaries.
Rainfall up until 2004 was measured manually using a cylindrical rain gauge of five inch diameter (5") within a turf-wall enclosure to reduce wind turbulence. In 2004 the Met Station at Rothamsted was automated and the 5" rain gauge replaced with an aerodynamically shaped tipping bucket rain gauge of ten inch diameter (type ARG100) within the enclosure. The manufacturers of the ARG100 state that "the ARG100 raingauge typically captures over 5% more rainfall than most traditionally-shaped cylindrical gauges due to its unique aerodynamic shape and reduced evaporation-loss properties". This has been found to be the case at Rothamsted. When we have compared the ARG100 with the 5" we get a difference of approximately ten percent over an eight year period (2004 to 2011).
We have therefore decided not to correct rainfall data but to advise that this difference exists. This does however mean that the 30 year average rainfall data are to be considered for use as guidance only.
Table of warnings about 30 year rainfall averages
30 Year Average
(Gauge used) |
Associated Weather Summary Table |
Status |
| 1971 to 2000 (5" only) |
2001 to 2010 |
up to 2003 - OK
2004 onwards - guidance only |
| 1981 to 2010 (5" and ARG100) |
2011 to 2020 |
guidance only |
| 1991 to 2020 (5" and ARG100) |
2021 onwards |
guidance only |
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |previous summaries
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2024 |
| (Departure from the 30 year means (1991 - 2020) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
83.6 |
(+19.73) |
7.0 |
(-0.06) |
1.5 |
(-0.05) |
16 |
3.6 |
6.1 |
72.6 |
(-1.55) |
15 |
| February |
63.7 |
(-22.46) |
10.6 |
(+3.07) |
4.7 |
(+3.21) |
9 |
6.5 |
7.8 |
130.0 |
(+73.03) |
21 |
| March |
106.1 |
(-22.26) |
11.4 |
(+1.18) |
4.8 |
(+1.98) |
9 |
7.0 |
8.4 |
90.0 |
(+42.93) |
19 |
| April |
156.4 |
(-15.66) |
13.3 |
(-0.08) |
6.0 |
(+1.56) |
4 |
8.8 |
10.2 |
67.4 |
(+13.45) |
19 |
| May |
186.9 |
(-16.41) |
17.8 |
(+1.34) |
9.6 |
(+2.29) |
0 |
13.8 |
13.5 |
114.8 |
(+61.54) |
16 |
| June |
241.4 |
(+35.58) |
19.4 |
(-0.08) |
9.0 |
(-1.20) |
1 |
15.5 |
14.8 |
21.5 |
(-33.30) |
10 |
| July |
205.0 |
(-1.85) |
21.5 |
(-0.45) |
11.9 |
(-0.46) |
0 |
17.3 |
16.8 |
91.0 |
(+35.56) |
12 |
| August |
211.5 |
(+22.15) |
22.5 |
(+0.87) |
12.7 |
(+0.44) |
0 |
17.8 |
17.5 |
23.2 |
(-48.83) |
12 |
| September |
126.7 |
(-23.95) |
18.6 |
(+0.02) |
10.8 |
(+0.61) |
4 |
12.1 |
15.7 |
185.2 |
(+127.51) |
18 |
| October |
98.9 |
(-14.13) |
14.9 |
(+0.60) |
8.0 |
(+0.48) |
5 |
10.9 |
13.3 |
62.0 |
(-19.31) |
27 |
| November |
58.7 |
(-13.49) |
9.8 |
(-0.26) |
4.7 |
(+0.41) |
12 |
7.6 |
12.2 |
66.7 |
(-14.55) |
14 |
| December |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1539.0 |
(-52.75) |
15.2 |
(+0.56) |
7.6 |
(+0.84) |
60 |
11.2 |
12.3 |
924.4 |
(+236.47) |
183 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2023 |
| (Departure from the 30 year means (1991 - 2020) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
88.1 |
(+24.21) |
8.0 |
(+0.94) |
1.3 |
(-0.30) |
17 |
3.8 |
5.8 |
79.6 |
(+5.47) |
22 |
| February |
110.3 |
(+24.16) |
9.6 |
(+2.04) |
2.2 |
(+0.69) |
13 |
4.3 |
5.7 |
5.7 |
(-51.29) |
11 |
| March |
89.9 |
(-38.49) |
9.8 |
(-0.45) |
3.7 |
(+0.82) |
11 |
5.8 |
7.0 |
117.2 |
(+70.09) |
25 |
| April |
176.3 |
(+4.24) |
13.0 |
(-0.41) |
4.0 |
(-0.47) |
12 |
8.1 |
9.4 |
65.0 |
(+11.05) |
16 |
| May |
211.6 |
(+8.25) |
16.6 |
(+0.07) |
7.7 |
(+0.40) |
5 |
13.0 |
12.7 |
48.9 |
(-4.38) |
11 |
| June |
250.1 |
(+44.32) |
23.3 |
(+3.78) |
11.2 |
(+1.02) |
0 |
18.2 |
15.7 |
16.0 |
(-38.86) |
7 |
| July |
181.3 |
(-25.49) |
20.9 |
(-1.10) |
12.2 |
(-0.11) |
0 |
17.3 |
16.7 |
97.8 |
(+42.31) |
21 |
| August |
182.9 |
(-6.51) |
21.2 |
(-0.45) |
12.2 |
(-0.07) |
0 |
16.9 |
17.2 |
50.5 |
(-21.49) |
16 |
| September |
181.6 |
(+30.92) |
22.5 |
(+3.98) |
13.0 |
(+2.79) |
0 |
16.7 |
17.0 |
60.3 |
(+2.53) |
11 |
| October |
135.4 |
(+22.38) |
16.5 |
(+2.17) |
8.8 |
(+1.28) |
4 |
11.8 |
14.4 |
100.9 |
(+19.53) |
19 |
| November |
85.4 |
(+13.20) |
10.3 |
(+0.19) |
4.0 |
(-0.29) |
12 |
6.7 |
10.0 |
75.6 |
(-5.56) |
21 |
| December |
37.6 |
(-23.22) |
9.4 |
(+2.04) |
4.6 |
(+2.62) |
10 |
6.1 |
7.8 |
101.3 |
(+25.70) |
26 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1730.5 |
(+77.97) |
15.1 |
(+1.04) |
7.1 |
(+0.68) |
84 |
10.7 |
11.6 |
818.6 |
(+55.09) |
206 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2022 |
| (Departure from the 30 year means (1991 - 2020) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
86.3 |
(+22.40) |
7.6 |
(+0.53) |
0.8 |
(-0.74) |
19 |
3.4 |
6.2 |
23.4 |
(-50.69) |
16 |
| February |
90.0 |
(+3.82) |
9.9 |
(+2.36) |
3.0 |
(+1.50) |
14 |
4.7 |
6.6 |
79.0 |
(+22.04) |
19 |
| March |
167.0 |
(+38.58) |
11.8 |
(+1.50) |
3.4 |
(+0.58) |
16 |
6.0 |
7.6 |
34.1 |
(-12.93) |
13 |
| April |
197.5 |
(+25.44) |
14.2 |
(+0.78) |
4.1 |
(-0.41) |
15 |
9.0 |
9.5 |
20.8 |
(-33.19) |
8 |
| May |
195.1 |
(-8.24) |
17.9 |
(+1.42) |
8.4 |
(+1.06) |
4 |
14.2 |
13.0 |
33.9 |
(-19.33) |
14 |
| June |
253.6 |
(+47.85) |
20.8 |
(+1.29) |
10.0 |
(-0.20) |
2 |
17.2 |
15.2 |
43.8 |
(-10.99) |
13 |
| July |
254.5 |
(+47.68) |
24.9 |
(+2.93) |
13.1 |
(+0.79) |
0 |
19.9 |
17.4 |
11.7 |
(-43.74) |
5 |
| August |
245.6 |
(+56.19) |
25.2 |
(+3.55) |
13.9 |
(+1.62) |
0 |
19.8 |
18.3 |
41.4 |
(-30.58) |
5 |
| September |
127.0 |
(-23.73) |
18.5 |
(-0.05) |
10.6 |
(+0.42) |
4 |
14.4 |
16.2 |
77.9 |
(+20.14) |
16 |
| October |
147.6 |
(+34.59) |
16.8 |
(+2.51) |
9.2 |
(+1.62) |
5 |
11.3 |
13.2 |
101.0 |
(+19.68) |
18 |
| November |
77.0 |
(+4.77) |
11.8 |
(+1.69) |
6.5 |
(+2.24) |
9 |
8.3 |
11.0 |
131.7 |
(+50.46) |
24 |
| December |
71.4 |
(+10.58) |
6.4 |
(-0.97) |
0.1 |
(-1.90) |
21 |
3.7 |
6.5 |
67.9 |
(-7.70) |
16 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1912.5 |
(+259.93) |
15.5 |
(+1.44) |
6.9 |
(+0.53) |
109 |
11.0 |
11.7 |
666.7 |
(-96.83) |
167 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2021 |
| (Departure from the 30 year means (1991 - 2020) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
52.0 |
(-11.91) |
5.8 |
(-1.20) |
0.4 |
(-1.22) |
18 |
3.1 |
5.0 |
113.6 |
(+39.48) |
23 |
| February |
80.8 |
(-5.38) |
8.1 |
(+0.56) |
2.2 |
(+0.73) |
14 |
4.0 |
5.2 |
45.8 |
(-11.15) |
15 |
| March |
112.0 |
(-16.36) |
10.7 |
(+0.42) |
3.5 |
(+0.62) |
18 |
5.5 |
6.9 |
27.6 |
(-19.47) |
13 |
| April |
215.8 |
(+43.79) |
11.6 |
(-1.84) |
1.1 |
(-3.36) |
22 |
7.1 |
8.0 |
1.6 |
(-52.40) |
4 |
| May |
150.4 |
(-52.92) |
14.73 |
(-1.78) |
6.2 |
(-1.10) |
10 |
10.4 |
10.7 |
94.4 |
(+41.14) |
24 |
| June |
184.7 |
(-21.09) |
20.3 |
(+0.77) |
11.8 |
(+1.62) |
0 |
17.1 |
15.9 |
77.6 |
(+22.78) |
11 |
| July |
195.6 |
(-11.18) |
22.3 |
(+0.29) |
13.8 |
(+1.04) |
0 |
18.5 |
17.7 |
51.0 |
(-4.46) |
17 |
| August |
114.2 |
(-75.21) |
19.9 |
(-1.69) |
12.3 |
(+0.02) |
0 |
16.6 |
16.9 |
37.0 |
(-34.99) |
13 |
| September |
136.2 |
(-14.46) |
20.6 |
(+2.08) |
11.5 |
(+1.32) |
0 |
15.4 |
16.0 |
54.1 |
(-3.60) |
11 |
| October |
95.1 |
(-17.97) |
15.2 |
(+0.94) |
8.6 |
(+1.01) |
4 |
11.2 |
13.2 |
104.8 |
(+23.51) |
17 |
| November |
82.1 |
(+9.89) |
10.0 |
(-0.07) |
3.9 |
(-0.37) |
13 |
6.4 |
9.8 |
19.2 |
(-62.02) |
16 |
| December |
23.5 |
(-37.31) |
8.6 |
(+1.16) |
3.9 |
(+1.94) |
9 |
5.7 |
7.5 |
76.2 |
(+0.58) |
24 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1442.4 |
(-210.13) |
14.0 |
(-0.03) |
6.6 |
(+0.19) |
108 |
10.1 |
11.1 |
702.9 |
(-60.59) |
188 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2020 |
| (Departure from the 30 year means (1981 - 2010) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
59.4 |
(-2.65) |
8.9 |
(+2.20) |
3.8 |
(+2.61) |
11 |
5.1 |
6.7 |
79.8 |
(+9.83) |
24 |
| February |
92.3 |
(+12.07) |
9.7 |
(+2.80) |
3.2 |
(+2.31) |
10 |
4.7 |
6.5 |
127.0 |
(+76.86) |
23 |
| March |
166.4 |
(+51.55) |
10.6 |
(+0.74) |
2.7 |
(+0.06) |
15 |
4.8 |
6.9 |
43.8 |
(-7.00) |
17 |
| April |
243.1 |
(+81.93) |
16.6 |
(+3.94) |
4.7 |
(+0.71) |
9 |
9.8 |
9.7 |
51.4 |
(-3.66) |
8 |
| May |
308.6 |
(+113.97) |
18.9 |
(+2.77) |
7.0 |
(+0.12) |
8 |
14.1 |
12.6 |
3.2 |
(-51.49) |
2 |
| June |
199.6 |
(+1.45) |
20.5 |
(+1.32) |
10.9 |
(+1.18) |
0 |
16.6 |
15.2 |
87.4 |
(+34.14) |
18 |
| July |
192.2 |
(-12.96) |
21.5 |
(-0.30) |
11.9 |
(+0.01) |
0 |
17.0 |
16.7 |
81.2 |
(+31.33) |
15 |
| August |
169.2 |
(-27.01) |
23.0 |
(+1.39) |
14.2 |
(+2.31) |
0 |
18.2 |
18.0 |
172.0 |
(+108.27) |
15 |
| September |
185.2 |
(+41.81) |
19.5 |
(+1.23) |
9.8 |
(-0.13) |
2 |
14.1 |
15.9 |
32.8 |
(-24.83) |
10 |
| October |
70.9 |
(-40.85) |
13.8 |
(-0.26) |
7.9 |
(+0.82) |
6 |
10.2 |
12.60 |
198.4 |
(+116.72) |
27 |
| November |
63.9 |
(-6.88) |
11.5 |
(+1.80) |
5.4 |
(+1.58) |
11 |
8.0 |
10.3 |
57.4 |
(-19.23) |
24 |
| December |
50.0 |
(-3.84) |
7.3 |
(+0.36) |
2.6 |
(+0.94) |
12 |
5.0 |
7.4 |
98.4 |
(+28.88) |
22 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1800.9 |
(+208.58) |
15.1 |
(+1.50) |
7.0 |
(+1.04) |
84 |
10.6 |
11.6 |
1032.8 |
(+299.82) |
205 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2019 |
| (Departure from the 30 year means (1981 - 2010) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
83.6 |
(+21.53) |
6.2 |
(-0.54) |
0.6 |
(-0.55) |
17 |
3.3 |
5.8 |
34.8 |
(-35.17) |
10 |
| February |
137.7 |
(+57.44) |
10.9 |
(+3.97) |
1.6 |
(+0.62) |
21 |
3.8 |
5.4 |
43.2 |
(-6.94) |
17 |
| March |
148.0 |
(+33.11) |
11.4 |
(+1.50) |
4.3 |
(+1.67) |
11 |
6.4 |
7.8 |
60.4 |
(+9.60) |
19 |
| April |
191.6 |
(+30.40) |
13.9 |
(+1.30) |
3.6 |
(-0.41) |
16 |
8.4 |
9.3 |
13.2 |
(-41.86) |
13 |
| May |
206.4 |
(+11.81) |
16.3 |
(+0.24) |
6.3 |
(-0.52) |
9 |
12.4 |
12.0 |
42.8 |
(-11.89) |
15 |
| June |
178.1 |
(-20.02) |
19.3 |
(+0.16) |
10.2 |
(+0.41) |
3 |
15.4 |
14.6 |
70.8 |
(+17.54) |
17 |
| July |
189.5 |
(-15.64) |
23.1 |
(+1.36) |
13.0 |
(+1.07) |
0 |
18.7 |
17.2 |
45.0 |
(-4.87) |
10 |
| August |
215.3 |
(+19.07) |
23.2 |
(+1.59) |
12.4 |
(+0.54) |
0 |
17.2 |
17.2 |
45.2 |
(-18.53) |
14 |
| September |
173.4 |
(+30.02) |
19.5 |
(+1.18) |
10.3 |
(+0.39) |
3 |
14.7 |
15.5 |
75.0 |
(+17.37) |
14 |
| October |
91.1 |
(-20.65) |
13.84 |
(-0.21) |
7.2 |
(+0.02) |
7 |
10.0 |
12.9 |
109.6 |
(+27.92) |
25 |
| November |
56.9 |
(-13.85) |
8.9 |
(-0.80) |
3.4 |
(-0.45) |
11 |
5.9 |
8.9 |
91.0 |
(+14.37) |
24 |
| December |
74.9 |
(+21.13) |
8.8 |
(+1.88) |
2.8 |
(+1.13) |
14 |
4.8 |
6.9 |
111.6 |
(+42.08) |
26 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1746.6 |
(+154.35) |
14.6 |
(+0.97) |
6.3 |
(+0.33) |
112 |
10.1 |
11.1 |
742.6 |
(+9.62) |
204 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2018 |
| (Departure from the 30 year means (1981 - 2010) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
64.9 |
(+2.83) |
8.2 |
(+1.46) |
2.2 |
(+0.96) |
15 |
3.8 |
5.5 |
76.1 |
(+6.15) |
23 |
| February |
116.6 |
(+36.29) |
5.2 |
(-1.72) |
-0.7 |
(-1.58) |
23 |
2.0 |
4.5 |
48.4 |
(-1.74) |
16 |
| March |
87.4 |
(-27.51) |
8.1 |
(-1.76) |
1.7 |
(-0.98) |
21 |
3.8 |
5.2 |
78.5 |
(+27.70) |
25 |
| April |
128.2 |
(-33.05) |
14.0 |
(+1.33) |
6.7 |
(+2.63) |
3 |
9.5 |
9.6 |
74.8 |
(+19.77) |
17 |
| May |
267.2 |
(+72.55) |
18.7 |
(+2.59) |
7.9 |
(+1.00) |
8 |
13.6 |
12.9 |
61.9 |
(+7.24) |
13 |
| June |
266.2 |
(+68.03) |
21.5 |
(+2.40) |
10.9 |
(+1.11) |
0 |
17.6 |
16.2 |
3.7 |
(-49.61) |
7 |
| July |
294.4 |
(+89.18) |
26.1 |
(+4.29) |
13.8 |
(+1.92) |
0 |
20.9 |
18.4 |
15.1 |
(-34.82) |
6 |
| August |
172.9 |
(-23.35) |
22.3 |
(+0.74) |
12.5 |
(+0.69) |
0 |
17.4 |
17.7 |
64.0 |
(+0.27) |
13 |
| September |
188.2 |
(+44.77) |
19.0 |
(+0.67) |
9.2 |
(-0.69) |
5 |
13.6 |
15.3 |
51.0 |
(-6.63) |
12 |
| October |
141.1 |
(+29.34) |
14.9 |
(+0.83) |
6.9 |
(-0.21) |
8 |
10.0 |
12.5 |
71.0 |
(-10.68) |
18 |
| November |
80.9 |
(+10.11) |
10.8 |
(+1.06) |
4.9 |
(+1.13) |
7 |
6.8 |
9.2 |
63.8 |
(-12.83) |
21 |
| December |
57.0 |
(+3.21) |
9.3 |
(+2.38) |
3.7 |
(+2.01) |
12 |
5.6 |
7.5 |
75 |
(+5.48) |
21 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1864.7 |
(+272.39) |
14.8 |
(+1.19) |
6.6 |
(+0.67) |
102 |
10.4 |
11.2 |
683.3 |
(-49.70) |
192 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2017 |
| (Departure from the 30 year means (1981 - 2010) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
77.2 |
(+15.19) |
6.3 |
(-0.38) |
-0.2 |
(-1.40) |
19 |
2.2 |
4.1 |
70.2 |
(+0.21) |
23 |
| February |
62.8 |
(-17.48) |
8.5 |
(+1.59) |
3.2 |
(+2.29) |
15 |
4.6 |
5.6 |
38.7 |
(-11.40) |
18 |
| March |
139.9 |
(+24.97) |
12.7 |
(+2.76) |
5.0 |
(+2.33) |
15 |
8.0 |
7.8 |
40.4 |
(-10.42) |
21 |
| April |
197.4 |
(+36.17) |
13.8 |
(+1.20) |
4.2 |
(+0.13) |
17 |
10.2 |
9.6 |
10.9 |
(-44.19) |
14 |
| May |
185.1 |
(-9.57) |
17.7 |
(+1.65) |
8.6 |
(+1.79) |
2 |
13.8 |
12.7 |
70.5 |
(+15.82) |
16 |
| June |
229.1 |
(+30.91) |
21.5 |
(+2.38) |
12.0 |
(+2.25) |
1 |
18.5 |
16.7 |
39.1 |
(-14.12) |
12 |
| July |
187.4 |
(-17.77) |
21.8 |
(+0.00) |
13.2 |
(+1.31) |
0 |
18.2 |
17.6 |
72.6 |
(+22.69) |
16 |
| August |
170.2 |
(-26.04) |
20.2 |
(-1.39) |
11.8 |
(-0.03) |
0 |
16.3 |
16.7 |
66.6 |
(+2.89) |
14 |
| September |
116.9 |
(-26.44) |
17.3 |
(-0.94) |
9.8 |
(-0.17) |
1 |
13.3 |
15.0 |
86.9 |
(+29.29) |
23 |
| October |
87.4 |
(-24.30) |
15.4 |
(+1.37) |
9.1 |
(+1.99) |
3 |
11.5 |
13.5 |
31.2 |
(-50.51) |
19 |
| November |
92.0 |
(+21.21) |
9.6 |
(-0.09) |
3.5 |
(-0.28) |
15 |
6.5 |
11.8 |
53.5 |
(-23.09) |
22 |
| December |
57.4 |
(+3.57) |
7.2 |
(+0.35) |
1.8 |
(+0.17) |
19 |
4.0 |
6.0 |
110.8 |
(+41.25) |
24 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1602.7 |
(+10.41) |
14.3 |
(+0.71) |
6.8 |
(+0.86) |
107 |
10.5 |
11.3 |
691.4 |
(-41.58) |
222 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2016 |
| (Departure from the 30 year means (1981 - 2010) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
64.5 |
(+2.46) |
8.1 |
(+1.36) |
1.8 |
(+0.63) |
16 |
4.3 |
6.5 |
92.3 |
(+22.34) |
25 |
| February |
111.5 |
(+31.19) |
8.0 |
(+1.09) |
1.6 |
(+0.67) |
18 |
3.6 |
5.9 |
46.9 |
(-3.27) |
18 |
| March |
133.4 |
(+18.45) |
9.2 |
(-0.65) |
1.8 |
(-0.92) |
18 |
4.4 |
6.2 |
84.3 |
(+33.52) |
16 |
| April |
167.6 |
(+6.37) |
11.9 |
(-0.73) |
3.5 |
(-0.52) |
12 |
7.2 |
8.8 |
62.0 |
(+6.96) |
24 |
| May |
197.0 |
(+2.40) |
17.4 |
(+1.34) |
7.9 |
(+0.99) |
7 |
13.0 |
12.4 |
39.4 |
(-15.30) |
11 |
| June |
141.0 |
(-57.17) |
19.0 |
(-0.11) |
11.2 |
(+1.45) |
0 |
15.8 |
15.5 |
84.8 |
(+31.58) |
22 |
| July |
210.3 |
(+5.09) |
22.2 |
(+0.43) |
12.8 |
(+0.89) |
0 |
18.3 |
17.3 |
27.1 |
(-22.80) |
16 |
| August |
217.6 |
(+21.38) |
22.7 |
(+1.17) |
12.9 |
(+1.02) |
0 |
17.8 |
17.1 |
30.1 |
(-33.58) |
12 |
| September |
128.0 |
(-15.44) |
20.4 |
(+2.10) |
12.2 |
(+2.29) |
0 |
15.8 |
16.5 |
70.3 |
(+12.68) |
16 |
| October |
104.0 |
(-7.73) |
14.2 |
(+0.18) |
7.4 |
(+0.30) |
4 |
10.3 |
12.4 |
30.1 |
(-51.55) |
22 |
| November |
91.1 |
(+20.40) |
8.8 |
(-0.94) |
2.6 |
(-1.24) |
11 |
5.8 |
8.6 |
85.7 |
(+9.04) |
21 |
| December |
68.7 |
(+14.91) |
8.7 |
(+1.77) |
2.1 |
(+0.40 |
18 |
4.8 |
6.7 |
26.2 |
(-43.28) |
24 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1634.6 |
(+42.31) |
14.2 |
(+0.58) |
6.5 |
(+0.50) |
104 |
10.1 |
11.2 |
679.3 |
(-53.66) |
227 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Rothamsted Research (Harpenden) |
| The weather : Monthly Summary : 2015 |
| (Departure from the 30 year means (1981 - 2010) in brackets) |
| |
| |
| |
Sunshine |
Mean Temperatures |
Rainfall |
| |
|
Maximum |
Minimum |
Ground Frost * |
10cm Under Bare Soil |
30cm Under Grass |
Total |
Duration |
| |
Hours |
( ) |
oC |
( ) |
oC |
( ) |
no. |
oC |
oC |
mm |
( ) |
days** |
| January |
90.6 |
(+28.51) |
7.5 |
(+0.76) |
0.9 |
(-0.32) |
17 |
5.0 |
7.2 |
81.9 |
(+11.93) |
25 |
| February |
85.6 |
(+5.31) |
6.7 |
(-0.21) |
0.8 |
(-0.17) |
18 |
2.4 |
4.1 |
54.6 |
(+4.42) |
21 |
| March |
158.9 |
(+43.99) |
10.2 |
(+0.27) |
2.9 |
(+0.27) |
15 |
5.4 |
6.2 |
26.1 |
(-24.67) |
16 |
| April |
231.7 |
(+70.50) |
14.5 |
(+1.85) |
4.2 |
(+0.13) |
15 |
8.8 |
9.6 |
31.0 |
(-24.05) |
14 |
| May |
203.4 |
(+8.79) |
15.6 |
(-0.53) |
7.0 |
(+0.12) |
6 |
11.9 |
12.3 |
68.4 |
(+13.75) |
19 |
| June |
227.9 |
(+29.77) |
19.5 |
(+0.33) |
9.2 |
(-0.58) |
3 |
15.5 |
14.7 |
26.7 |
(-26.55) |
12 |
| July |
210.4 |
(+5.20) |
21.4 |
(-0.40) |
11.7 |
(-0.15) |
0 |
16.4 |
16.9 |
132.6 |
(+82.71) |
17 |
| August |
141.2 |
(-55.00) |
20.5 |
(-1.10) |
12.1 |
(+0.29) |
0 |
16.4 |
16.6 |
83.2 |
(+19.49) |
15 |
| September |
154.4 |
(+10.96) |
16.9 |
(-1.38) |
8.45 |
(-1.47) |
4 |
12.3 |
14.7 |
45.5 |
(-12.18) |
20 |
| October |
94.2 |
(-17.50) |
14.2 |
(+0.16) |
7.8 |
(+0.71) |
5 |
10.4 |
12.4 |
64.6 |
(-17.04) |
21 |
| November |
46.4 |
(-24.30) |
12.3 |
(+2.57) |
6.6 |
(+2.79) |
5 |
8.7 |
10.9 |
84.0 |
(+7.40) |
26 |
| December |
48.2 |
(-5.60) |
12.5 |
(+5.56) |
7.3 |
(+5.66) |
3 |
8.4 |
9.5 |
81.8 |
(+12.29) |
24 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Year |
1692.9 |
(+100.64) |
14.3 |
(+0.66) |
6.6 |
(+0.59) |
91 |
10.1 |
11.1 |
780.5 |
(+47.50) |
230 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
