|
VALENTIA OBSERVATORY
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|
monthly and annual mean and extreme values
|
|
1961-1990
|
|
TEMPERATURE (degrees Celsius) |
jan
|
feb
|
mar
|
apr
|
may
|
jun
|
jul
|
aug
|
sep
|
oct
|
nov
|
dec
|
year
|
|
mean daily max.
|
9.3 |
9.3 |
10.5 |
12.2 |
14.3 |
16.4 |
17.9 |
18.0 |
16.6 |
14.3 |
11.4 |
10.1 |
13.4
|
|
mean daily min.
|
4.2 |
3.9 |
4.6 |
5.5 |
7.5 |
10.1 |
11.7 |
11.6 |
10.3 |
8.6 |
6.0 |
5.0 |
7.4
|
|
mean
|
6.8 |
6.6 |
7.6 |
8.9 |
10.9 |
13.3 |
14.8 |
14.8 |
13.5 |
11.5 |
8.7 |
7.6 |
10.4
|
|
absolute max.
|
13.6 |
15.1 |
20.3 |
24.0 |
26.9 |
25.7 |
29.7 |
28.4 |
25.9 |
22.5 |
19.8 |
15.3 |
29.7
|
|
absolute min.
|
-5.9 |
-7.3 |
-5.1 |
-1.6 |
0.5 |
2.8 |
5.3 |
3.3 |
2.8 |
-1.4 |
-4.0 |
-5.3 |
-7.3
|
|
mean no. of days with air frost
|
3.4 |
3.3 |
2.2 |
0.6 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
1.3 |
3.0 |
13.9
|
|
mean no. of days with ground frost
|
7.5 |
7.1 |
6.1 |
4.3 |
1.1 |
0.1 |
0.0 |
0.0 |
0.2 |
1.1 |
4.5 |
6.8 |
38.7
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RELATIVE HUMIDITY (%) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean at 0900UTC
|
84 |
83 |
83 |
79 |
78 |
81 |
84 |
85 |
85 |
86 |
84 |
85 |
83
|
|
mean at 1500UTC
|
80 |
77 |
75 |
73 |
73 |
77 |
79 |
79 |
78 |
80 |
79 |
81 |
78
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
SUNSHINE (hours) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean daily duration
|
1.41 |
2.16 |
3.05 |
5.00 |
5.81 |
5.12 |
4.53 |
4.50 |
3.61 |
2.53 |
1.72 |
1.17 |
3.39
|
|
greatest daily duration
|
7.5 |
9.0 |
11.1 |
13.5 |
15.1 |
15.8 |
15.6 |
14.4 |
12.1 |
9.6 |
8.1 |
6.4 |
15.8
|
|
mean no. of days with no sun
|
11 |
7 |
6 |
3 |
2 |
4 |
4 |
4 |
4 |
7 |
9 |
13 |
75
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RAINFALL (mm) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean monthly total
|
167 |
123.1 |
121.7 |
77 |
88.5 |
79.9 |
73.3 |
111.2 |
124.9 |
157.3 |
147.1 |
159.3 |
1430.3
|
|
greatest daily total
|
45.6 |
46.2 |
37.1 |
52.7 |
37.5 |
58.3 |
32.4 |
85.6 |
55.6 |
64.6 |
86.6 |
62.0 |
86.6
|
|
mean no. of days with >= 0.2mm
|
23 |
19 |
21 |
17 |
18 |
17 |
17 |
19 |
19 |
22 |
22 |
24 |
239
|
|
mean no. of days with >= 1.0mm
|
20 |
16 |
16 |
12 |
14 |
13 |
12 |
15 |
15 |
19 |
18 |
19 |
187
|
|
mean no. of days with >= 5.0mm
|
11 |
8 |
8 |
5 |
7 |
5 |
5 |
7 |
8 |
11 |
10 |
10 |
95
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
WIND (knots) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean monthly speed
|
13.1 |
12.6 |
12.1 |
10.1 |
10.3 |
9.1 |
8.5 |
8.9 |
10.0 |
11.4 |
11.8 |
12.6 |
10.9
|
|
max. gust
|
87 |
79 |
67 |
63 |
61 |
58 |
53 |
60 |
88 |
75 |
70 |
82 |
88
|
|
max. mean 10-minute speed
|
54 |
49 |
40 |
38 |
39 |
40 |
31 |
36 |
58 |
49 |
45 |
47 |
58
|
|
mean no. of days with gales
|
2.5 |
2.0 |
1.3 |
0.3 |
0.4 |
0.0 |
0.0 |
0.1 |
0.5 |
0.8 |
1.5 |
1.8 |
11.2
|
|
|
|
|
|
|
|
|
|
|
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WEATHER (mean no. of days with...) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
snow or sleet
|
1.5 |
1.7 |
1.1 |
0.3 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
0.8 |
5.6
|
|
snow lying at 0900UTC
|
0.2 |
0.4 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
0.8
|
|
hail
|
5.1 |
4.2 |
4.6 |
2.5 |
1.1 |
0.1 |
0.0 |
0.1 |
0.3 |
0.9 |
2.9 |
3.6 |
25.5
|
|
thunder
|
1.2 |
0.8 |
0.6 |
0.2 |
0.3 |
0.3 |
0.6 |
0.4 |
0.5 |
0.7 |
0.8 |
0.7 |
7.1
|
|
fog
|
0.4 |
0.4 |
0.2 |
0.9 |
0.9 |
1.2 |
1.5 |
1.2 |
0.7 |
0.6 |
0.4 |
0.4 |
8.9
|
