Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
January
46.3
67
56
31
February
76.7
100
52
94
March
84.9
67
97
88
April
72.2
60
100
May
79.4
83
74
June
82.6
76
94
July
94.2
94
94
August
65.3
75
44
September
71.1
71
71
October
61.8
68
54
November
58.0
58
58
December
47.8
83
35
Average
71.9
74.5
74.8
66.3
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
January
1.0
1
1
0
February
4.8
8
2
6
March
7.6
7
8
7
April
9.6
9
10
May
14.8
13
18
June
21.0
23
19
July
23.0
22
24
August
19.8
20
20
September
16.5
22
13
October
12.7
12
13
November
6.0
5
7
December
0.8
2
0
Average
9.5
5.3
11.7
11.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-1.9
0
1
-1
February
3.8
7
1
6
March
5.6
4
6
6
April
7.2
7
8
May
11.9
10
15
June
19.2
21
17
July
21.1
20
23
August
17.1
17
17
September
14.0
21
9
October
9.0
9
9
November
4.9
4
6
December
-1.6
2
-2
Average
7.4
3.1
9.8
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
43.4
28
56
46
February
17.8
15
12
28
March
20.5
25
25
6
April
38.8
40
36
May
27.9
34
19
June
23.9
17
35
July
21.1
19
25
August
44.2
47
38
September
22.2
0
32
October
10.9
19
0
November
61.2
68
50
December
30.4
50
24
Average
27.3
23.6
30.6
27.8
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
January
8.3
9
8
8
February
8.7
10
6
12
March
8.9
7
11
8
April
8.5
8
10
May
6.5
7
6
June
7.8
8
8
July
7.2
7
7
August
7.3
9
4
September
6.5
6
7
October
5.0
6
4
November
7.0
9
4
December
3.9
8
3
Average
7.5
8.0
7.6
6.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
254°
223°
256°
February
224°
038°
240°
March
219°
240°
046°
April
231°
246°
May
353°
296°
June
328°
255°
July
246°
252°
August
251°
321°
September
032°
243°
October
227°
106°
November
272°
266°
December
205°
048°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.