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
84.3
91
94
80
82
74
February
83.7
82
80
90
79
March
93.8
92
88
96
93
April
98.1
99
96
98
98
May
98.5
97
100
97
99
June
99.4
99
100
99
100
July
96.2
99
98
100
100
August
96.6
98
98
99
82
September
96.2
95
97
97
95
October
95.9
98
95
98
99
November
87.7
90
87
93
90
December
79.1
83
85
93
85
Average
93.6
91.0
94.8
93.5
96.1
92.5
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
-11.0
-8.9
-11.5
-11.0
-10.5
-17.0
February
-9.1
-11.3
-9.5
-9.6
-11.0
March
0.6
0.0
2.2
-3.6
-1.0
April
8.8
7.9
4.0
9.6
7.2
May
16.0
16.3
14.4
20.3
15.0
June
23.0
23.5
23.6
22.1
20.8
July
23.8
26.3
24.8
22.0
25.1
August
22.6
23.1
23.5
18.8
22.6
September
14.1
11.5
16.8
13.6
13.1
October
6.6
5.2
9.5
6.4
7.0
November
-4.1
-1.5
-6.7
-5.7
-2.0
December
-11.2
-8.2
-13.6
-14.9
-10.6
Average
5.3
-8.9
7.1
6.9
6.9
6.0
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
-22.9
-15.1
-23.6
-22.8
-20.5
-28.5
February
-21.9
-24.8
-20.5
-19.5
-23.6
March
-11.8
-10.5
-9.4
-14.5
-13.8
April
-4.8
-4.5
-8.7
-2.3
-4.5
May
3.0
3.5
1.8
4.2
2.9
June
10.2
10.3
10.5
9.6
8.4
July
12.5
15.5
13.5
11.5
12.0
August
10.4
12.3
10.5
9.5
10.5
September
3.0
3.0
3.7
2.3
2.0
October
-3.5
-3.7
-2.1
-3.5
-4.5
November
-12.2
-9.0
-14.4
-12.0
-9.4
December
-19.1
-16.8
-22.3
-22.6
-17.5
Average
-6.8
-15.1
-4.7
-5.6
-4.3
-5.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
32.7
31
25
55
19
41
February
24.2
27
22
23
38
March
22.7
30
28
20
28
April
13.6
12
20
13
19
May
10.4
11
9
6
11
June
6.1
5
3
7
9
July
5.3
6
3
7
3
August
6.0
6
5
12
3
September
10.1
14
6
6
7
October
18.9
22
11
15
11
November
38.2
24
36
40
43
December
42.3
45
33
41
45
Average
17.9
31.1
16.3
15.9
14.4
17.8
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
2025
2024
2023
2022
2021
January
6.0
7
6
7
4
6
February
5.6
5
5
6
7
March
8.8
10
10
9
9
April
9.1
10
10
9
9
May
8.6
8
8
8
9
June
6.6
7
7
7
7
July
5.8
5
6
7
5
August
5.5
5
5
8
5
September
6.1
7
5
7
6
October
7.1
9
8
7
6
November
7.4
8
6
7
9
December
6.0
6
5
7
7
Average
6.9
7.0
7.1
6.9
7.3
7.1
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
234°
237°
241°
232°
269°
February
225°
235°
235°
251°
March
254°
255°
242°
242°
April
264°
254°
259°
258°
May
251°
298°
265°
276°
June
218°
258°
245°
260°
July
283°
252°
264°
356°
August
224°
263°
269°
299°
September
247°
259°
271°
197°
October
250°
246°
242°
240°
November
245°
224°
253°
246°
December
249°
234°
258°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.