|
ROCHE'S POINT
|
|
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.
|
8.5 |
8.3 |
9.6 |
11.4 |
13.7 |
16.4 |
18.2 |
18.1 |
16.2 |
13.7 |
10.7 |
9.3 |
12.8
|
|
mean daily min.
|
4.1 |
4.1 |
4.5 |
5.6 |
7.8 |
10.3 |
12.0 |
12.0 |
10.7 |
8.9 |
6.0 |
5.1 |
7.6
|
|
mean
|
6.3 |
6.2 |
7.1 |
8.5 |
10.7 |
13.4 |
15.1 |
15.1 |
13.5 |
11.3 |
8.3 |
7.2 |
10.2
|
|
absolute max.
|
13.5 |
14.0 |
14.9 |
20.1 |
21.5 |
25.3 |
27.5 |
26.5 |
23.3 |
19.1 |
16.4 |
14.4 |
27.5
|
|
absolute min.
|
-7.2 |
-5.1 |
-3.4 |
-0.3 |
0.8 |
3.4 |
7.2 |
6.8 |
4.7 |
1.9 |
-0.9 |
-3.7 |
-7.2
|
|
mean no. of days with air frost
|
2.5 |
2.0 |
0.9 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.2 |
1.3 |
7.0
|
|
mean no. of days with ground frost
|
10.2 |
7.3 |
6.6 |
5.1 |
1.2 |
0.1 |
0.0 |
0.0 |
0.1 |
0.9 |
5.2 |
8.0 |
44.6
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RELATIVE HUMIDITY (%) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean at 0900UTC
|
87 |
86 |
85 |
81 |
81 |
82 |
83 |
84 |
87 |
88 |
87 |
88 |
85
|
|
mean at 1500UTC
|
82 |
80 |
76 |
74 |
76 |
77 |
77 |
77 |
78 |
81 |
81 |
83 |
79
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
SUNSHINE (hours) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean daily duration
|
1.79 |
2.31 |
3.50 |
5.27 |
6.18 |
5.92 |
5.57 |
5.21 |
4.27 |
2.87 |
2.34 |
1.66 |
3.91
|
|
greatest daily duration
|
8.3 |
9.2 |
11.6 |
13.7 |
15.1 |
15.8 |
15.4 |
14.4 |
12.8 |
9.9 |
8.7 |
7.1 |
15.8
|
|
mean no. of days with no sun
|
10 |
8 |
6 |
3 |
2 |
2 |
1 |
2 |
3 |
6 |
9 |
11 |
63
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RAINFALL (mm) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean monthly total
|
104.2 |
87.2 |
76 |
55.3 |
63.3 |
54 |
53.6 |
80.1 |
78.1 |
95.7 |
87.9 |
100.3 |
935.7
|
|
greatest daily total
|
47.0 |
40.2 |
38.4 |
37.5 |
35.5 |
44.5 |
46.9 |
84.4 |
50.9 |
54.8 |
46.1 |
58.1 |
84.4
|
|
mean no. of days with >= 0.2mm
|
19 |
16 |
16 |
13 |
15 |
13 |
11 |
14 |
15 |
17 |
17 |
17 |
184
|
|
mean no. of days with >= 1.0mm
|
15 |
13 |
11 |
10 |
11 |
9 |
8 |
11 |
10 |
12 |
12 |
13 |
135
|
|
mean no. of days with >= 5.0mm
|
7 |
6 |
5 |
4 |
4 |
3 |
3 |
5 |
5 |
6 |
6 |
7 |
63
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
WIND (knots) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
mean monthly speed
|
14.6 |
14.0 |
13.4 |
11.8 |
11.5 |
10.3 |
9.9 |
10.3 |
11.2 |
12.7 |
13.0 |
14.1 |
12.2
|
|
max. gust
|
86 |
82 |
76 |
71 |
58 |
53 |
57 |
60 |
75 |
83 |
75 |
78 |
86
|
|
max. mean 10-minute speed
|
62 |
56 |
52 |
53 |
43 |
41 |
40 |
42 |
52 |
54 |
49 |
53 |
62
|
|
mean no. of days with gales
|
6 |
4.4 |
4.2 |
1.8 |
1.5 |
0.3 |
0.5 |
0.9 |
1.8 |
3.1 |
3.5 |
5.3 |
33.3
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
WEATHER (mean no. of days with...) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
snow or sleet
|
2.6 |
3.0 |
1.3 |
0.3 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.2 |
1.1 |
8.7
|
|
snow lying at 0900UTC
|
0.5 |
0.6 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
1.3
|
|
hail
|
1.0 |
1.0 |
2.4 |
1.6 |
0.8 |
0.1 |
0.0 |
0.1 |
0.0 |
0.2 |
0.3 |
0.4 |
8.0
|
|
thunder
|
0.2 |
0.3 |
0.1 |
0.1 |
0.5 |
0.7 |
0.8 |
0.6 |
0.4 |
0.3 |
0.1 |
0.1 |
4.2
|
|
fog
|
2.9 |
2.4 |
3.6 |
3.7 |
4.2 |
5.1 |
4.9 |
5.1 |
4.9 |
4.3 |
2.8 |
2.7 |
46.5
|
