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
2025
2024
2023
2022
2021
January
76.0
70
75
81
83
82
February
71.9
56
78
82
79
76
March
82.3
95
85
77
93
81
April
85.8
84
92
85
83
May
93.3
96
95
95
99
88
June
93.7
84
91
94
94
100
July
94.7
98
91
93
98
August
95.3
90
93
94
97
September
94.6
90
96
94
91
October
86.7
83
94
92
72
November
79.9
78
89
72
90
December
75.7
79
86
62
58
Average
88.2
82.5
88.2
90.4
90.6
88.4
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
2025
2024
2023
2022
2021
January
-17.2
-19.3
-16.8
-17.1
-19.6
-21.6
February
-16.8
-16.0
-16.3
-21.6
-17.0
-19.5
March
-12.2
-17.6
-16.0
-13.9
-10.5
-15.5
April
-7.9
-7.0
-11.8
-3.0
-8.9
May
2.9
1.3
1.1
2.7
7.2
3.6
June
13.0
10.5
10.6
12.5
12.9
13.0
July
16.1
17.1
16.5
13.6
15.0
August
14.1
11.8
14.0
15.0
13.5
September
8.8
9.6
7.7
7.5
5.7
October
-1.4
0.6
2.0
-3.7
-6.5
November
-7.9
-5.5
-4.3
-8.7
-14.8
December
-15.3
-12.4
-19.6
-5.7
-14.0
Average
-3.7
-8.2
-2.4
-3.9
-1.7
-4.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
-24.2
-27.1
-24.6
-24.8
-27.5
-28.8
February
-23.4
-25.8
-24.3
-27.1
-25.6
-27.1
March
-20.3
-24.1
-24.8
-22.6
-18.1
-25.8
April
-14.9
-15.5
-19.6
-9.5
-15.5
May
-4.2
-7.7
-5.2
-6.5
-2.9
-4.7
June
4.4
3.5
2.2
4.2
5.2
3.6
July
8.6
8.5
9.3
7.0
7.7
August
6.4
4.2
6.7
6.5
5.4
September
2.5
4.4
1.5
1.8
-2.8
October
-7.7
-6.9
-4.9
-9.0
-11.3
November
-14.8
-12.8
-11.4
-15.0
-20.1
December
-22.3
-19.8
-25.6
-14.5
-24.5
Average
-10.6
-16.5
-9.3
-10.8
-8.3
-12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
46.0
56
46
45
36
45
February
46.0
56
65
34
40
42
March
42.2
22
48
56
30
51
April
24.6
36
25
35
34
May
9.9
6
17
6
3
17
June
9.6
20
16
8
12
5
July
13.8
8
15
17
24
August
14.0
22
17
13
10
September
18.4
23
21
30
21
October
29.6
45
30
12
46
November
35.8
47
33
40
38
December
44.7
45
30
68
69
Average
23.1
26.9
28.5
22.2
21.7
27.0
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
2025
2024
2023
2022
2021
January
11.1
11
10
13
8
10
February
12.6
14
13
10
12
13
March
11.7
9
10
14
9
12
April
10.6
11
9
12
10
May
8.9
8
10
8
9
10
June
10.3
12
10
11
11
9
July
10.2
13
9
10
9
August
9.4
11
10
10
10
September
9.5
11
10
10
9
October
10.6
14
9
8
9
November
12.1
13
12
12
9
December
13.0
14
12
19
14
Average
10.4
10.5
11.4
10.2
10.1
10.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
338°
003°
045°
029°
016°
February
063°
015°
011°
029°
038°
March
009°
006°
346°
046°
001°
April
012°
013°
071°
032°
May
339°
021°
327°
188°
084°
June
119°
128°
133°
135°
143°
July
101°
128°
120°
097°
August
008°
081°
149°
111°
September
130°
002°
004°
352°
October
066°
065°
335°
017°
November
057°
056°
071°
035°
December
036°
353°
079°
016°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.