Royston (Iceni) Weather Station
2009 Annual Summary
Part 1 Temperature, Rainfall & Sunshine
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T e m p e r a t u r e (°C) |
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Rainfall (mm) |
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Sunshine (Hours) |
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Month |
Mean Maximum |
Highest Maximum |
Date(s) |
Lowest Maximum |
Date(s) |
Mean Minimum |
Highest Minimum |
Date(s) |
Lowest Minimum |
Date(s) |
Mean Grass Minimum |
Lowest Grass Minimum |
Date(s) |
Mean Dry Bulb (5 min. obs.) |
Mean Earth 30cms 0900 GMT |
Mean Earth 30cms 2100 GMT |
No. of Air Frosts |
No. of Ground Frosts |
Air Frost Duration (Hours) |
Total |
No. of Days with 0.2mm or more |
Most in a Day |
Date(s) |
Rainfall Duration (Hours) |
Total |
Highest |
Date(s) |
No. of Days no sun |
Month |
|
JAN |
5.4 |
9.6 |
12 |
-1.3 |
9 |
0.9 |
7.0 |
17 |
-7.0 |
6 |
-1.1 |
-14.0 |
6 |
2.6 |
3.7 |
3.8 |
11 |
18 |
164.0 |
49.3 |
14 |
6.1 |
24 |
46.5 |
85.7 |
7.1 |
31 |
6 |
JAN |
|
FEB |
6.9 |
14.4 |
27 |
0.6 |
6 |
1.8 |
7.5 |
25 |
-4.5 |
3 |
-0.5 |
-9.0 |
3 |
3.7 |
3.9 |
4.1 |
10 |
14 |
122.2 |
64.9 |
15 |
19.6 |
9 |
50.5 |
65.6 |
9.7 |
21 |
7 |
FEB |
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MAR |
12.1 |
16.6 |
16 |
7.5 |
4 |
3.6 |
8.7 |
12 |
-1.7 |
5 |
0.9 |
-5.5 |
5 |
7.1 |
7.1 |
7.4 |
3 |
13 |
12.3 |
31.6 |
12 |
9.9 |
3 |
26.1 |
162.4 |
11.4 |
18 |
0 |
MAR |
|
APR |
16.1 |
21.0 |
15 |
10.5 |
11 |
6.0 |
9.9 |
16 |
1.7 |
21 |
3.6 |
-1.6 |
5 |
10.5 |
10.9 |
11.4 |
0 |
7 |
0.0 |
19.4 |
9 |
8.1 |
16 |
15.3 |
196.2 |
13.3 |
22 |
3 |
APR |
|
MAY |
18.7 |
25.5 |
31 |
13.6 |
4 |
8.5 |
12.8 |
28 |
3.4 |
11 |
6.4 |
0.5 |
11 |
13.1 |
14.2 |
14.8 |
0 |
0 |
0.0 |
34.9 |
11 |
19.5 |
25 |
16.5 |
239.3 |
16.0 |
30 |
2 |
MAY |
|
JUN |
21.4 |
29.0 |
30 |
13.5 |
5 |
10.6 |
15.3 |
27 29 |
4.7 |
4 |
8.7 |
1.5 |
4 |
15.5 |
17.4 |
18.0 |
0 |
0 |
0.0 |
57.1 |
11 |
17.3 |
26 |
21.3 |
210.6 |
15.5 |
30 |
0 |
JUN |
|
JUL |
22.2 |
29.1 |
1 |
18.7 |
17 |
12.8 |
16.5 |
3 |
9.1 |
10 |
11.4 |
7.4 |
10 |
16.9 |
18.8 |
19.4 |
0 |
0 |
0.0 |
68.9 |
19 |
11.5 |
16 |
51.2 |
210.2 |
14.7 |
2 |
0 |
JUL |
|
AUG |
23.0 |
28.5 |
19 |
19.3 |
21 |
13.8 |
17.8 |
6 |
10.0 |
29 |
12.0 |
7.5 |
29 |
17.8 |
18.5 |
19.1 |
0 |
0 |
0.0 |
77.1 |
10 |
52.4 |
6 |
17.7 |
206.6 |
12.9 |
23 |
0 |
AUG |
|
SEP |
20.1 |
27.1 |
8 |
16.2 |
13 |
11.1 |
17.0 |
8 |
6.5 |
10 |
8.6 |
2.6 |
10 |
14.7 |
16.1 |
16.5 |
0 |
0 |
0.0 |
8.3 |
3 |
5.8 |
2 |
6.9 |
154.0 |
11.5 |
18 |
1 |
SEP |
|
OCT |
15.3 |
19.3 |
6 |
11.3 |
19 |
8.8 |
12.2 |
3 |
3.4 |
18 |
6.5 |
-1.4 |
18 |
11.5 |
12.8 |
13.1 |
0 |
2 |
0.0 |
31.2 |
14 |
6.9 |
7 |
22.4 |
97.0 |
9.2 |
13 |
3 |
OCT |
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NOV |
11.6 |
16.2 |
1 |
5.7 |
30 |
6.7 |
12.2 |
19 20 |
1.5 |
10 |
4.4 |
-2.5 |
9 |
8.8 |
9.6 |
9.6 |
0 |
2 |
0.0 |
104.4 |
24 |
14.4 |
28 |
74.1 |
93.3 |
8.0 |
7 |
2 |
NOV |
|
DEC |
5.7 |
12.2 |
5 |
0.2 |
18 |
1.4 |
10.4 |
6 |
-5.1 |
19 |
-0.8 |
-10.1 |
19 |
3.3 |
5.6 |
5.7 |
11 |
16 |
138.8 |
77.7 |
20 |
14.5 |
29 |
85.2 |
92.9 |
6.8 |
10 |
6 |
DEC |
|
YEAR |
14.9 |
X |
X |
X |
X |
7.2 |
X |
X |
X |
X |
5.0 |
X |
X |
10.5 |
11.6 |
11.9 |
35 |
72 |
437.3 |
624.8 |
162 |
X |
X |
433.7 |
1813.8 |
X |
X |
30 |
YEAR |
Part 2 Air Pressure, Wind Direction, Wind Speed, Humidity, Cloud Cover, Fog, Snow Falling, Snow Lying, Hail & Thunder
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P r e s s u r e (mb) |
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Wind Direction 0900 GMT (No. of Days) |
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Wind Speed (MPH) |
Humidity(%) |
Cloud |
No of Days With: |
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Month |
Mean MSL Pressure |
Highest |
Date(s) |
Lowest |
Date(s) |
N |
NE |
E |
SE |
S |
SW |
W |
NW |
CALM |
Mean Wind Speed |
Maximum Gust |
Date |
Mean Relative Humidity (5 min.obs.) |
Mean Cloud Cover 0900 GMT (oktas) |
Fog (visibility < 1000m @ 0900 GMT) |
Fog (visibility < 200m @ 0900 GMT) |
Snow or Rain and Snow |
Snow Lying (> 50% cover @ 0900 GMT) |
Hail |
Thunder |
Month |
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JAN |
1008 |
1031 |
2, 3 |
963 |
23 |
1 |
1 |
0 |
3 |
10 |
9 |
2 |
2 |
3 |
5.3 |
53 |
17 |
93.4 |
6.7 |
2 |
0 |
3 |
3 |
0 |
0 |
JAN |
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FEB |
1013 |
1031 |
20, 21 |
975 |
10 |
2 |
2 |
1 |
1 |
2 |
1 |
9 |
8 |
2 |
3.8 |
35 |
10 |
90.9 |
6.5 |
1 |
0 |
8 |
14 |
0 |
0 |
FEB |
|
MAR |
1012 |
1035 |
17 |
976 |
4 |
1 |
1 |
2 |
1 |
2 |
4 |
12 |
8 |
0 |
5.9 |
48 |
3 |
81.4 |
4.6 |
1 |
1 |
1 |
0 |
4 |
0 |
MAR |
|
APR |
1011 |
1027 |
20 |
991 |
27 |
6 |
6 |
3 |
2 |
5 |
4 |
4 |
0 |
0 |
3.5 |
48 |
8 |
80.4 |
5.3 |
4 |
0 |
0 |
0 |
0 |
1 |
APR |
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MAY |
1016 |
1032 |
29 |
998 |
15 |
2 |
3 |
5 |
0 |
3 |
9 |
8 |
1 |
0 |
5.4 |
45 |
8 |
74.3 |
4.7 |
0 |
0 |
0 |
0 |
0 |
0 |
MAY |
|
JUN |
1016 |
1028 |
23 |
998 |
7 |
2 |
8 |
3 |
3 |
1 |
2 |
4 |
7 |
0 |
4.3 |
33 |
17 |
72.3 |
4.9 |
0 |
0 |
0 |
0 |
0 |
2 |
JUN |
|
JUL |
1010 |
1023 |
1 |
999 |
23 |
0 |
0 |
1 |
2 |
6 |
13 |
9 |
0 |
0 |
7.1 |
33 |
6 18 29 |
73.1 |
5.4 |
0 |
0 |
0 |
0 |
0 |
4 |
JUL |
|
AUG |
1014 |
1022 |
22 |
1002 |
31 |
3 |
0 |
0 |
0 |
9 |
13 |
4 |
2 |
0 |
6.4 |
40 |
26 |
73.1 |
4.5 |
0 |
0 |
0 |
0 |
0 |
1 |
AUG |
|
SEP |
1020 |
1037 |
11 |
990 |
3 |
6 |
6 |
0 |
0 |
1 |
5 |
11 |
1 |
0 |
5.7 |
39 |
3 |
74.9 |
5.0 |
0 |
0 |
0 |
0 |
0 |
0 |
SEP |
|
OCT |
1016 |
1033 |
15 |
995 |
21 |
3 |
0 |
2 |
4 |
8 |
3 |
9 |
2 |
0 |
5.1 |
38 |
3 |
80.6 |
6.1 |
0 |
0 |
0 |
0 |
0 |
0 |
OCT |
|
NOV |
1000 |
1020 |
9 |
982 |
3 |
1 |
1 |
0 |
3 |
10 |
11 |
4 |
0 |
0 |
9.3 |
50 |
25 |
84.0 |
4.8 |
1 |
0 |
0 |
0 |
0 |
0 |
NOV |
|
DEC |
1006 |
1034 |
11 |
983 |
22 |
3 |
4 |
0 |
1 |
6 |
8 |
6 |
2 |
1 |
6.4 |
40 |
17 |
89.3 |
4.8 |
2 |
0 |
7 |
8 |
1 |
0 |
DEC |
|
YEAR |
1011.8 |
X |
X |
X |
X |
30 |
32 |
17 |
20 |
63 |
82 |
82 |
33 |
6 |
5.7 |
X |
X |
80.6 |
5.3 |
11 |
1 |
19 |
25 |
5 |
8 |
YEAR |
Click on the links below to access the graphs and charts representing the data in the above tables.........
1. Monthly Mean Maximum & Minimum Temperatures 2. Monthly Temperature Extremes
3. Monthly Mean Earth (30 cms Depth) Temperature 4. Monthly Frequency of Air & Ground Frost, and Air Frost Duration
5. Monthly Rainfall 6. Monthly Rainfall Duration 7. Monthly Sunshine Duration
8. Monthly Rainfall & Mean MSL Air Pressure 9. Monthly Mean, Highest and Lowest MSL Air Pressure
10. Monthly Wind Direction Frequency @ 0900 GMT
11. Monthly Maximum Gust & Mean Wind Speed 12. Monthly Mean Relative Humidity
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(This page last updated 20th January 2010 2047 GMT)