|
CASEMENT AERODROME
|
|
monthly and annual mean and extreme values
|
|
1968-1996
|
|
TEMPERATURE (degrees
Celsius) |
jan
|
feb
|
mar
|
apr
|
may
|
jun
|
jul
|
aug
|
sep
|
oct
|
nov
|
dec
|
year
|
|
mean daily max.
|
7.8
|
7.6
|
9.6
|
11.8
|
14.6
|
17.7
|
19.7
|
19.3
|
16.8
|
13.6
|
9.9
|
8.3
|
13.1
|
|
mean daily min.
|
2.0
|
1.7
|
2.5
|
3.2
|
5.7
|
8.6
|
10.7
|
10.3
|
8.5
|
6.7
|
3.6
|
2.8
|
5.5
|
|
mean
|
4.9
|
4.6
|
6.0
|
7.5
|
10.1
|
13.1
|
15.2
|
14.8
|
12.6
|
10.1
|
6.7
|
5.6
|
9.3
|
|
absolute max.
|
15.4
|
14.7
|
18.8
|
21.3
|
24.7
|
27.5
|
29.8
|
30.5
|
24.7
|
21.3
|
17.7
|
15.4
|
30.5
|
|
absolute min.
|
-12.4
|
-10.3
|
-7.8
|
-4.5
|
-3.0
|
0.3
|
2.5
|
2.5
|
-0.3
|
-4.1
|
-6.2
|
-9.7
|
-12.4
|
|
mean no. of days with air frost
|
7.5
|
7.7
|
6.3
|
4.9
|
1.0
|
0.0
|
0.0
|
0.0
|
0.0
|
1.4
|
5.9
|
6.6
|
41.3
|
|
mean no. of days with ground frost
|
15.3
|
15.0
|
13.1
|
12.8
|
6.3
|
1.1
|
0.1
|
0.1
|
1.6
|
4.5
|
11.0
|
13.5
|
94.3
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RELATIVE HUMIDITY (%) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean at 0900UTC
|
87
|
86
|
84
|
80
|
77
|
77
|
79
|
81
|
84
|
86
|
87
|
87
|
83
|
|
mean at 1500UTC
|
82
|
77
|
72
|
68
|
68
|
68
|
68
|
68
|
71
|
76
|
81
|
83
|
74
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
SUNSHINE (hours) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean daily duration
|
1.63
|
2.38
|
3.04
|
4.85
|
5.65
|
5.63
|
5.01
|
4.83
|
4.04
|
3.07
|
2.16
|
1.42
|
3.64
|
|
greatest daily duration
|
8.1
|
9.2
|
10.9
|
13.6
|
15.4
|
16.0
|
15.4
|
14.4
|
12.3
|
9.8
|
8.5
|
6.9
|
16.0
|
|
mean no. of days with no sun
|
10
|
7
|
5
|
2
|
2
|
2
|
1
|
2
|
3
|
5
|
7
|
11
|
55
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RAINFALL (mm) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean monthly total
|
63.9
|
48.6
|
50.3
|
50.8
|
58.1
|
52.6
|
46.9
|
68.5
|
63.3
|
68.6
|
65.9
|
73.6
|
711.1
|
|
greatest daily total
|
31.4
|
42.8
|
30.0
|
35.3
|
34.3
|
108.6
|
41.4
|
73.0
|
32.1
|
48.5
|
58.4
|
42.9
|
108.6
|
|
mean no. of days with >= 0.2mm
|
18
|
14
|
17
|
14
|
15
|
14
|
14
|
14
|
15
|
16
|
16
|
17
|
185
|
|
mean no. of days with >= 1.0mm
|
13
|
10
|
12
|
10
|
11
|
10
|
9
|
10
|
10
|
11
|
11
|
12
|
131
|
|
mean no. of days with >= 5.0mm
|
5
|
3
|
3
|
3
|
4
|
3
|
3
|
4
|
4
|
4
|
4
|
5
|
45
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
WIND (knots) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean monthly speed
|
14.1
|
12.5
|
12.8
|
10.1
|
9.1
|
8.7
|
8.9
|
8.7
|
10.1
|
11.2
|
12.3
|
13.3
|
11.0
|
|
max. gust
|
80
|
78
|
71
|
59
|
63
|
53
|
58
|
58
|
69
|
65
|
68
|
81
|
81
|
|
max. mean 10-minute speed
|
57
|
54
|
47
|
43
|
43
|
36
|
39
|
39
|
46
|
44
|
49
|
57
|
57
|
|
mean no. of days with gales
|
5.2
|
2.7
|
2.7
|
0.6
|
0.5
|
0.1
|
0.1
|
0.2
|
0.6
|
1.4
|
2.4
|
3.7
|
20.3
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
WEATHER (mean
no. of days with..) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
snow or sleet
|
4.6
|
4.8
|
3.5
|
1.4
|
0.1
|
0.0
|
0.0
|
0.0
|
0.0
|
0.0
|
0.4
|
2.1
|
16.9
|
|
snow lying at 0900UTC
|
2.4
|
1.8
|
0.4
|
0.1
|
0.0
|
0.0
|
0.0
|
0.0
|
0.0
|
0.0
|
0.1
|
0.5
|
5.3
|
|
hail
|
0.8
|
1.2
|
2.8
|
2.2
|
1.3
|
0.5
|
0.1
|
0.1
|
0.3
|
0.1
|
0.7
|
0.6
|
10.7
|
|
thunder
|
0.0
|
0.1
|
0.2
|
0.3
|
0.9
|
0.9
|
0.8
|
0.6
|
0.3
|
0.2
|
0.2
|
0.1
|
4.8
|
|
fog
|
2.5
|
2.3
|
1.8
|
2.4
|
1.6
|
1.4
|
1.2
|
2.8
|
2.9
|
2.7
|
1.8
|
2.3
|
25.9
|
