Royston (Iceni) Weather Station
2001 Annual Summary
Part 1 Temperature, Rainfall & Sunshine
T e m p e r a t u r e (°C) |
Rainfall (mm) |
Sunshine (Hours) |
||||||||||||||||||||||||||
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 09 GMT |
Mean Earth 30cms 21 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 |
JAN |
5.6 |
10.5 |
23 |
1.0 |
19 |
0.9 |
8.5 |
2 |
-5.6 |
16 |
-1.5 |
-9.0 |
16 |
2.7 |
3.2 |
3.3 |
12 |
17 |
153.4 |
59.6 |
13 |
17.7 |
26 |
92.3 |
95.8 |
7.5 |
24 |
9 |
FEB |
8.2 |
13.0 |
11 |
4.0 |
27 |
1.8 |
10.1 |
12 |
-4.0 |
25 |
-0.5 |
-5.6 |
25 |
4.2 |
4.3 |
4.4 |
9 |
17 |
47.9 |
90.7 |
16 |
21.8 |
7 |
85.5 |
90.5 |
9.7 |
25 |
7 |
MAR |
9.0 |
16.9 |
31 |
2.8 |
17 |
2.7 |
8.4 |
11 |
-5.1 |
3 |
0.9 |
-11.1 |
3 |
5.1 |
5.8 |
6.2 |
6 |
12 |
66.1 |
87.2 |
22 |
12.9 |
16 |
105.3 |
88.4 |
10.0 |
30 |
7 |
APR |
12.6 |
19.8 |
2 |
8.3 |
20 |
4.3 |
9.0 |
6 |
-0.5 |
21 |
2.4 |
-3.3 |
19 |
7.7 |
9.5 |
10.0 |
2 |
7 |
5.7 |
74.0 |
23 |
8.9 |
14 |
81.5 |
119.4 |
9.5 |
28 |
1 |
MAY |
18.9 |
25.9 |
11 |
10.7 |
17 |
7.6 |
16.3 |
28 |
1.1 |
5 |
5.9 |
-1.5 |
5 |
12.7 |
14.2 |
14.9 |
0 |
1 |
0.0 |
28.1 |
7 |
10.1 |
15 |
27.1 |
235.5 |
15.0 |
22 |
1 |
JUN |
20.1 |
27.6 |
26 |
13.7 |
17 |
10.2 |
16.0 |
27 |
4.0 |
3 |
8.6 |
1.6 |
9 |
14.9 |
16.8 |
17.5 |
0 |
0 |
0.0 |
21.0 |
8 |
12.4 |
16 |
17.2 |
216.3 |
15.7 |
25 |
1 |
JUL |
23.3 |
30.9 |
29 |
17.6 |
19 |
13.6 |
19.4 |
29 |
7.7 |
16 |
11.8 |
5.0 |
16 |
18.0 |
18.9 |
19.6 |
0 |
0 |
0.0 |
59.3 |
11 |
23.5 |
17 |
35.7 |
200.5 |
15.5 |
4 |
1 |
AUG |
22.9 |
30.9 |
15 |
16.2 |
9 |
13.8 |
18.5 |
15 |
8.9 |
10 |
12.3 |
7.2 |
28 |
17.8 |
19.0 |
19.5 |
0 |
0 |
0.0 |
61.5 |
15 |
10.3 |
11 |
50.4 |
196.9 |
14.5 |
1 |
4 |
SEP |
17.4 |
22.0 |
28 |
13.6 |
17 |
10.1 |
15.6 |
2 |
6.3 |
17 |
8.4 |
4.0 |
23 |
13.1 |
15.4 |
15.7 |
0 |
0 |
0.0 |
69.0 |
16 |
13.0 |
28 |
73.4 |
112.2 |
10.4 |
28 |
2 |
OCT |
17.1 |
23.0 |
13 |
11.4 |
21 |
11.4 |
14.7 |
11 |
8.1 |
29 |
9.9 |
5.8 |
19 |
13.5 |
13.6 |
13.7 |
0 |
0 |
0.0 |
137.8 |
20 |
51.8 |
20 |
72.4 |
131.2 |
8.7 |
30 |
1 |
NOV |
10.3 |
14.5 |
2 |
4.9 |
8 |
5.0 |
12.0 |
30 |
-0.9 |
10 14 |
3.2 |
-3.8 |
15 |
7.0 |
8.4 |
8.5 |
4 |
7 |
22.4 |
42.3 |
15 |
7.9 |
7 |
51.8 |
77.3 |
8.0 |
1 |
7 |
DEC |
5.8 |
12.9 |
5 |
1.5 |
22 |
1.1 |
11.0 |
1 |
-4.1 |
15 |
-1.3 |
-7.6 |
31 |
2.8 |
5.1 |
5.0 |
13 |
21 |
161.1 |
22.7 |
14 |
5.0 |
4 |
33.6 |
88.8 |
6.6 |
8 |
7 |
YEAR |
14.3 |
X |
X |
X |
X |
6.9 |
X |
X |
X |
X |
5.0 |
X |
X |
10.0 |
11.2 |
11.5 |
46 |
82 |
456.6 |
753.2 |
180 |
X |
X |
726.2 |
1652.8 |
X |
X |
48 |
Part 2 Air Pressure, Wind Direction, Wind Speed, Relative Humidity, Cloud Cover, Fog, Snow Falling, Snow Lying, Hail & Thunder
MSL Air P r e s s u r e (mB) |
Wind Direction 0900 GMT (No. of Days) |
Wind Speed (MPH) |
Humidity |
Cloud |
No of Days With: |
||||||||||||||||||||
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 09h (oktas) |
Fog (visibility < 1000m @ 09 GMT) |
Fog (visibility < 200m @ 09 GMT) |
Snow or Rain and Snow |
Snow Lying (> 50% cover @ 09 GMT) |
Hail |
Thunder |
JAN |
1008.7 |
1037 |
14 |
977 |
24 |
1 |
5 |
1 |
2 |
4 |
7 |
5 |
0 |
6 |
4.0 |
48 |
5 |
92.0 |
4.6 |
3 |
0 |
3 |
6 |
0 |
0 |
FEB |
1016.5 |
1043 |
17 |
984 |
4 5 |
2 |
1 |
0 |
2 |
3 |
5 |
7 |
3 |
5 |
4.6 |
53 |
6 |
89.4 |
5.4 |
5 |
3 |
3 |
1 |
2 |
0 |
MAR |
1003.3 |
1019 |
5 6 |
990 |
28 29 |
5 |
7 |
1 |
4 |
1 |
6 |
3 |
1 |
3 |
4.2 |
37 |
31 |
87.9 |
5.8 |
0 |
0 |
5 |
3 |
1 |
0 |
APR |
1011.7 |
1033 |
13 |
995 |
4 6 |
7 |
1 |
0 |
1 |
5 |
8 |
3 |
4 |
1 |
5.5 |
41 |
5 |
80.9 |
5.7 |
0 |
0 |
2 |
0 |
8 |
0 |
MAY |
1018.5 |
1031 |
8 |
996 |
17 |
6 |
11 |
2 |
0 |
0 |
5 |
4 |
3 |
0 |
3.2 |
41 |
16 17 |
74.8 |
4.5 |
0 |
0 |
0 |
0 |
1 |
3 |
JUN |
1016.6 |
1028 |
18 19 |
1002 |
16 |
1 |
2 |
0 |
4 |
3 |
7 |
7 |
6 |
0 |
4.1 |
32 |
7 30 |
68.2 |
5.1 |
0 |
0 |
0 |
0 |
0 |
4 |
JUL |
1012.6 |
1028 |
2 |
993 |
18 |
3 |
3 |
1 |
3 |
1 |
8 |
6 |
4 |
2 |
3.4 |
51 |
11 |
73.0 |
4.8 |
1 |
0 |
0 |
0 |
0 |
1 |
AUG |
1013.3 |
1027 |
1 |
998 |
7 8 19 |
4 |
0 |
0 |
4 |
7 |
9 |
5 |
1 |
1 |
3.8 |
35 |
8 16 |
77.2 |
4.9 |
0 |
0 |
0 |
0 |
0 |
3 |
SEP |
1013.4 |
1022 |
17 |
993 |
30 |
2 |
1 |
0 |
2 |
2 |
4 |
4 |
12 |
3 |
4.2 |
35 |
30 |
84.6 |
5.8 |
2 |
1 |
0 |
0 |
0 |
1 |
OCT |
1011.0 |
1034 |
31 |
987 |
7 |
0 |
0 |
0 |
2 |
13 |
14 |
2 |
0 |
0 |
5.9 |
48 |
7 |
89.3 |
5.3 |
0 |
0 |
0 |
0 |
0 |
0 |
NOV |
1023.9 |
1042 |
16 |
995 |
8 |
2 |
0 |
0 |
0 |
1 |
9 |
10 |
3 |
5 |
4.3 |
39 |
21 27 |
88.8 |
5.4 |
0 |
0 |
2 |
0 |
0 |
0 |
DEC |
1024.9 |
1042 |
14 |
998 |
25 |
1 |
2 |
0 |
1 |
3 |
3 |
9 |
3 |
9 |
4.1 |
46 |
5 28 |
91.0 |
4.7 |
4 |
2 |
4 |
2 |
0 |
0 |
YEAR |
1014.5 |
X |
X |
X |
X |
34 |
33 |
5 |
25 |
43 |
85 |
65 |
40 |
35 |
4.3 |
X |
X |
83.1 |
5.2 |
15 |
6 |
19 |
12 |
12 |
12 |
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 17th January 2002 2106 GMT)