Royston (Iceni) Weather Station
1999 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 hrs |
Mean Earth 30cms 21 hrs |
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 |
8.4 |
14.2 |
6 |
2.7 |
22 |
3.5 |
11.4 |
20 |
-4.0 |
23 |
1.2 |
-7.8 |
23 |
5.6 |
5.3 |
5.3 |
5 |
11 |
41.9 |
68.7 |
19 |
10.5 |
27 |
82.8 |
74.9 |
7.3 |
22 |
6 |
FEB |
8.0 |
13.1 |
19 |
1.9 |
9 |
2.6 |
8.6 |
4 |
-4.0 |
9 |
0.1 |
-8.0 |
9 |
4.8 |
4.8 |
5.0 |
8 |
13 |
81.1 |
19.8 |
15 |
5.6 |
26 |
42.2 |
94.6 |
9.0 |
13 |
3 |
MAR |
11.7 |
19.7 |
31 |
3.2 |
6 |
4.9 |
10.5 |
2 |
-1.4 |
11 |
2.5 |
-6.0 |
11 |
7.7 |
7.6 |
8.1 |
2 |
9 |
6.9 |
39.1 |
15 |
8.3 |
7 |
60.2 |
112.5 |
11.1 |
17 |
4 |
APR |
14.8 |
19.9 |
30 |
9.1 |
13 |
5.8 |
12.1 |
5 |
-1.0 |
14 |
3.6 |
-4.5 |
15 |
9.5 |
11.2 |
11.7 |
2 |
4 |
6.8 |
29.0 |
13 |
5.8 |
20 |
32.6 |
160.2 |
13.9 |
30 |
2 |
MAY |
18.8 |
24.5 |
29 |
13.0 |
30 |
9.1 |
14.7 |
28 |
4.5 |
17 |
7.0 |
1.1 |
17 |
13.4 |
15.1 |
15.7 |
0 |
0 |
0.0 |
26.8 |
13 |
11.7 |
30 |
17.1 |
174.5 |
13.7 |
27 |
2 |
JUN |
19.6 |
25.9 |
16 |
14.5 |
12 |
10.2 |
14.3 |
27 |
6.1 |
8 |
8.4 |
4.2 |
9 |
14.6 |
17.3 |
18.0 |
0 |
0 |
0.0 |
78.2 |
16 |
20.4 |
1 |
49.1 |
220.3 |
16.4 |
25 |
2 |
JUL |
24.1 |
29.6 |
31 |
16.7 |
22 |
13.3 |
17.9 |
3 |
8.0 |
27 |
11.0 |
4.9 |
27 |
18.2 |
19.9 |
20.6 |
0 |
0 |
0.0 |
50.3 |
9 |
24.9 |
6 |
10.3 |
241.5 |
15.2 |
18 |
0 |
AUG |
21.7 |
30.9 |
2 |
15.8 |
10 |
13.0 |
18.0 |
3 |
5.6 |
22 |
10.9 |
3.5 |
22 |
16.8 |
18.4 |
18.9 |
0 |
0 |
0.0 |
77.6 |
13 |
24.1 |
8 |
47.5 |
148.4 |
11.6 |
1 |
4 |
SEP |
21.3 |
28.9 |
11 |
13.5 |
14 |
12.6 |
16.1 |
11 |
8.5 |
10 |
10.6 |
5.7 |
10 |
16.2 |
17.2 |
17.6 |
0 |
0 |
0.0 |
67.7 |
19 |
14.4 |
19 |
52.3 |
168.7 |
12.3 |
2 |
3 |
OCT |
14.9 |
18.0 |
10 30 |
9.0 |
20 |
7.6 |
14.0 |
10 |
1.6 |
18 |
5.1 |
-2.5 |
18 |
10.3 |
11.8 |
12.0 |
0 |
7 |
0.0 |
45.5 |
10 |
11.6 |
1 |
41.0 |
146.5 |
9.7 |
13 |
2 |
NOV |
10.2 |
16.5 |
1 |
5.3 |
18 |
5.4 |
11.5 |
1 |
0.0 |
18 |
3.3 |
-2.7 |
21 |
7.3 |
8.4 |
8.6 |
0 |
8 |
0.0 |
25.4 |
16 |
6.6 |
5 |
41.1 |
82.0 |
7.7 |
2 |
2 |
DEC |
7.4 |
12.0 |
3 24 |
0.6 |
19 |
2.6 |
9.5 |
1 |
-4.5 |
20 |
0.3 |
-8.0 |
20 |
4.2 |
5.0 |
5.0 |
7 |
13 |
70.3 |
73.2 |
21 |
12.9 |
22 |
68.9 |
81.2 |
6.4 |
19 |
7 |
YEAR |
15.1 |
X |
X |
X |
X |
7.6 |
X |
X |
X |
X |
5.3 |
X |
X |
10.7 |
11.8 |
12.2 |
24 |
65 |
207.0 |
601.3 |
179 |
X |
X |
545.1 |
1705.3 |
X |
X |
37 |
PART 2 Pressure, Wind, Relative Humidity, Cloud Cover, Fog, Snow, Hail & Thunder
P r e s s u r e (mb) |
Wind Direction 0900 h (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 @ 09hr) |
Fog (visibility < 200m @ 09hr) |
Snow or Rain and Snow |
Snow Lying (> 50% cover @ 09hr) |
Hail |
Thunder |
JAN |
1010.3 |
1041 |
31 |
987 |
16 |
0 |
0 |
0 |
0 |
8 |
14 |
2 |
3 |
4 |
6.8 |
55 |
15 |
90.1 |
5.2 |
1 |
0 |
1 |
1 |
0 |
0 |
FEB |
1016.9 |
1041 |
1 2 |
1000 |
22 |
0 |
1 |
0 |
1 |
2 |
5 |
8 |
11 |
0 |
6.4 |
51 |
22 28 |
82.6 |
5.6 |
0 |
0 |
3 |
2 |
2 |
0 |
MAR |
1009.3 |
1030 |
16 |
980 |
3 4 |
2 |
1 |
1 |
1 |
4 |
6 |
7 |
8 |
1 |
4.7 |
51 |
2 |
82.6 |
5.2 |
2 |
0 |
1 |
0 |
1 |
0 |
APR |
1011.8 |
1027 |
27 |
991 |
12 |
2 |
6 |
0 |
5 |
2 |
6 |
5 |
4 |
0 |
4.4 |
53 |
13 |
80.0 |
5.1 |
0 |
0 |
1 |
0 |
1 |
1 |
MAY |
1014.2 |
1023 |
31 |
1006 |
7 |
2 |
8 |
1 |
2 |
1 |
11 |
5 |
0 |
1 |
3.9 |
37 |
21 |
75.6 |
5.2 |
0 |
0 |
0 |
0 |
0 |
2 |
JUN |
1015.5 |
1027 |
15 18 |
997 |
6 |
2 |
4 |
0 |
2 |
1 |
5 |
9 |
6 |
1 |
3.0 |
39 |
2 4 |
73.3 |
4.3 |
0 |
0 |
0 |
0 |
0 |
4 |
JUL |
1016.0 |
1029 |
8 |
1003 |
3 |
1 |
9 |
0 |
2 |
2 |
3 |
11 |
2 |
1 |
3.3 |
44 |
20 |
71.0 |
4.9 |
2 |
0 |
0 |
0 |
0 |
4 |
AUG |
1011.2 |
1025 |
28 |
994 |
8 |
2 |
6 |
0 |
2 |
6 |
5 |
4 |
4 |
2 |
2.3 |
32 |
19 |
76.0 |
5.2 |
0 |
0 |
0 |
0 |
1 |
6 |
SEP |
1006.7 |
1028 |
9 10 |
986 |
20 |
1 |
3 |
0 |
3 |
9 |
6 |
4 |
3 |
1 |
3.6 |
32 |
18 |
81.1 |
5.1 |
2 |
0 |
0 |
0 |
0 |
4 |
OCT |
1012.6 |
1031 |
13 |
971 |
24 |
0 |
4 |
2 |
1 |
4 |
8 |
8 |
1 |
3 |
3.9 |
41 |
2 |
84.6 |
3.4 |
0 |
0 |
0 |
0 |
0 |
0 |
NOV |
1020.1 |
1038 |
9 |
991 |
5 |
6 |
2 |
0 |
0 |
3 |
8 |
5 |
4 |
2 |
4.9 |
46 |
30 |
88.6 |
5.1 |
0 |
0 |
0 |
0 |
1 |
0 |
DEC |
1006.2 |
1028 |
20 |
976 |
24 25 |
1 |
0 |
0 |
0 |
4 |
13 |
9 |
2 |
2 |
7.5 |
55 |
3 23 |
87.6 |
4.5 |
0 |
0 |
3 |
2 |
0 |
0 |
YEAR |
1012.6 |
X |
X |
X |
X |
19 |
44 |
4 |
19 |
46 |
90 |
77 |
48 |
18 |
4.6 |
X |
X |
81.1 |
4.9 |
7 |
0 |
9 |
5 |
6 |
21 |
Click below for graphs and charts....
1. Maximum & Minimum Temperatures 2. Temperature Extremes 3. Earth Temperature
4. Rainfall 5. Rainfall Duration 6. Sunshine
7. Air & Ground Frosts 8. Wind Direction 9. Wind Speed
10. Relative Humidity 11. Air Pressure 12. Rainfall/Air Pressure
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(This page last updated 15th January 2000)