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
61.6
45
66
79
60
69
February
79.6
87
75
83
77
85
March
91.7
94
96
88
94
92
April
91.2
91
88
90
93
May
98.5
100
100
97
99
100
June
97.5
98
96
99
99
98
July
97.1
98
97
99
98
August
97.6
98
97
99
97
September
98.0
99
99
97
96
October
94.9
96
94
88
97
November
82.8
82
69
86
71
December
84.3
91
78
99
91
Average
90.1
86.1
91.3
89.7
91.1
91.3
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
2025
2024
2023
2022
2021
January
-13.9
-11.5
-13.3
-13.9
-14.8
-15.6
February
-7.2
-8.9
-7.5
-5.0
-9.4
-9.5
March
4.5
4.0
2.7
7.9
3.2
4.7
April
14.6
16.1
13.5
14.4
14.0
May
21.5
21.0
20.5
22.1
20.6
21.6
June
25.7
26.6
25.0
27.1
25.3
25.6
July
28.6
28.5
26.6
28.3
29.6
August
25.8
27.6
25.8
26.5
25.3
September
21.6
22.0
23.6
22.8
20.6
October
13.2
13.4
15.5
11.8
13.3
November
-1.8
2.7
-5.5
1.3
-1.3
December
-11.4
-10.5
-12.0
-10.0
-10.9
Average
10.2
6.9
10.8
10.8
10.9
10.3
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
-24.6
-22.1
-24.8
-24.6
-25.5
-26.3
February
-19.3
-20.8
-18.8
-18.3
-21.6
-20.5
March
-7.3
-7.2
-7.2
-5.0
-6.4
-6.5
April
2.3
4.0
2.2
2.6
2.2
May
9.9
10.0
9.6
9.9
9.0
10.3
June
16.1
16.8
16.1
16.8
16.1
15.9
July
20.3
20.3
19.8
20.3
22.1
August
17.5
19.6
18.1
16.0
16.8
September
10.6
10.1
11.8
10.6
11.0
October
1.2
2.2
1.7
0.4
1.0
November
-10.2
-7.2
-14.9
-9.3
-9.5
December
-21.8
-19.8
-22.6
-20.8
-18.3
Average
-1.6
-4.0
0.9
0.1
0.4
0.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
8.2
7
12
5
11
11
February
8.7
8
3
7
18
9
March
5.9
4
2
5
11
8
April
4.7
3
5
6
5
May
8.5
7
11
2
11
8
June
9.6
12
16
6
8
12
July
8.7
14
17
8
6
August
9.9
8
13
6
8
September
6.3
4
2
5
12
October
4.2
1
2
9
5
November
9.2
8
15
6
17
December
4.6
4
2
0
5
Average
7.5
7.4
7.4
6.9
8.3
8.6
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
6.9
6
7
7
6
7
February
8.2
9
8
8
8
9
March
9.7
11
9
10
10
9
April
11.5
11
12
13
11
May
10.8
10
10
11
11
10
June
8.2
8
8
8
8
8
July
7.0
7
8
6
7
August
7.3
6
7
9
8
September
8.2
9
8
9
6
October
9.2
10
8
8
9
November
9.0
8
9
9
8
December
8.0
7
7
11
8
Average
8.7
8.8
8.3
8.7
8.8
8.3
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
243°
243°
251°
257°
219°
February
254°
241°
255°
248°
261°
March
288°
259°
241°
271°
248°
April
249°
267°
255°
251°
May
248°
287°
249°
262°
240°
June
250°
232°
209°
164°
201°
July
175°
193°
163°
190°
August
270°
240°
247°
215°
September
234°
232°
220°
145°
October
233°
269°
273°
252°
November
252°
254°
247°
251°
December
243°
241°
244°
247°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.