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
94.5
100
100
94
93
96
February
96.7
99
96
100
99
March
92.9
96
88
94
94
April
94.4
91
96
95
93
May
96.1
97
99
91
99
June
97.7
97
99
97
100
July
94.0
98
96
99
89
August
96.5
97
97
97
91
September
97.5
96
97
98
99
October
92.5
82
92
97
98
November
83.0
83
86
73
85
December
92.1
96
82
82
87
Average
95.1
100.0
94.6
94.4
94.3
94.5
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
-18.5
-18.1
-24.6
-18.1
-13.9
-20.8
February
-13.4
-17.3
-15.0
-11.9
-11.8
March
-7.9
-4.5
-9.3
-4.2
-9.3
April
1.6
3.1
1.8
0.1
0.1
May
9.6
11.0
9.0
7.2
9.0
June
16.9
15.5
21.1
15.1
18.1
July
21.0
21.3
21.8
23.8
19.6
August
19.0
18.1
19.8
17.3
19.6
September
13.2
13.3
11.4
12.3
13.5
October
2.7
3.6
3.7
-1.8
0.2
November
-9.8
-8.5
-11.6
-11.5
-6.5
December
-17.8
-11.0
-16.4
-19.3
-18.5
Average
-1.7
-18.2
2.0
1.8
2.4
1.6
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
-30.2
-32.8
-37.5
-28.1
-26.0
-30.6
February
-26.0
-31.3
-30.6
-24.8
-23.6
March
-21.1
-16.5
-25.8
-21.6
-26.3
April
-11.8
-9.5
-9.1
-13.5
-13.8
May
-1.5
-1.5
-2.9
-1.9
-1.0
June
4.7
3.9
5.2
4.7
4.2
July
8.5
8.0
9.5
10.0
9.5
August
7.4
6.2
7.5
9.5
8.0
September
2.0
3.9
2.1
0.1
-1.8
October
-10.8
-6.5
-8.9
-16.9
-14.8
November
-19.3
-18.1
-21.8
-24.5
-16.0
December
-27.4
-21.1
-25.1
-32.8
-29.6
Average
-13.6
-32.7
-10.5
-10.2
-10.0
-11.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
19.0
2
3
30
16
25
February
15.4
19
25
2
8
March
23.3
26
29
20
14
April
17.9
21
19
11
21
May
17.1
5
14
35
14
June
9.8
14
0
10
11
July
8.8
10
10
4
15
August
12.5
19
16
19
4
September
17.4
30
24
17
8
October
17.9
32
15
15
11
November
35.7
36
38
49
36
December
30.4
25
41
43
44
Average
15.8
2.1
19.0
19.1
18.0
15.7
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
4.0
3
2
5
4
5
February
5.4
5
4
6
7
March
6.0
6
5
6
6
April
7.0
7
7
7
7
May
7.7
8
8
9
7
June
7.2
7
8
6
7
July
6.4
6
6
7
6
August
6.2
6
6
7
6
September
6.3
6
6
6
6
October
5.4
6
4
5
6
November
5.5
6
7
5
5
December
5.0
6
5
4
5
Average
5.9
3.3
6.0
6.1
6.3
6.2
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
045°
074°
017°
034°
011°
February
006°
351°
006°
012°
March
052°
061°
042°
329°
April
096°
072°
016°
087°
May
140°
136°
135°
182°
June
199°
222°
219°
228°
July
219°
217°
222°
224°
August
196°
263°
166°
235°
September
102°
114°
185°
295°
October
014°
091°
351°
351°
November
040°
026°
060°
082°
December
359°
041°
010°
014°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.