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
90.2
95
97
97
90
94
February
91.3
99
69
76
91
100
March
93.1
93
97
90
93
79
April
94.4
92
88
93
95
May
97.0
98
99
93
97
June
99.0
99
99
99
98
July
98.8
99
99
99
100
August
97.7
99
98
100
99
September
97.3
92
98
99
99
October
96.3
97
99
99
96
November
93.6
95
97
97
97
December
93.7
88
100
94
99
Average
95.3
95.6
93.8
95.0
95.8
95.9
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
0.2
0.6
1.7
-1.5
1.5
-1.4
February
3.5
2.6
1.5
2.7
0.4
8.3
March
11.3
8.3
11.0
12.4
13.5
12.6
April
15.9
16.6
14.0
16.6
13.6
May
21.0
23.6
19.8
21.6
21.1
June
24.8
24.6
25.3
27.1
24.5
July
27.3
28.0
28.3
27.6
29.3
August
24.9
26.6
26.8
24.6
25.5
September
20.4
19.3
21.8
21.6
22.0
October
13.5
14.5
14.5
14.5
12.1
November
7.3
8.0
8.0
8.5
5.9
December
0.4
-1.3
2.6
-2.5
1.7
Average
13.2
3.8
14.6
14.7
15.2
14.7
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
-16.6
-15.1
-15.8
-16.0
-14.4
-18.6
February
-12.6
-10.0
-11.4
-11.6
-13.0
-10.9
March
-4.4
-5.2
-3.0
-3.3
-2.6
-3.0
April
2.3
4.7
1.7
2.7
2.7
May
7.9
10.3
8.6
7.9
8.1
June
12.4
12.8
12.5
14.1
12.8
July
14.8
15.9
14.8
15.1
15.5
August
13.8
14.8
14.1
15.8
13.1
September
9.3
11.4
10.6
8.5
9.9
October
1.8
2.6
3.2
2.7
2.0
November
-7.5
-4.0
-6.0
-6.7
-10.5
December
-15.7
-15.8
-13.5
-15.0
-14.8
Average
-1.8
-10.1
2.2
1.6
2.1
1.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.7
6
2
0
2
5
February
7.1
5
14
13
11
1
March
2.4
6
1
2
0
2
April
7.9
13
9
3
11
May
7.3
7
4
4
8
June
7.1
8
2
4
6
July
8.0
6
7
6
4
August
8.8
6
4
7
6
September
7.9
12
7
4
9
October
5.7
3
12
3
5
November
4.1
3
4
4
3
December
4.6
5
1
3
0
Average
6.3
5.6
6.5
5.4
4.2
5.1
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
4.3
4
5
5
4
5
February
5.1
5
5
5
5
6
March
6.0
6
6
7
7
6
April
6.8
7
8
7
7
May
6.9
7
8
7
7
June
6.1
6
7
7
6
July
5.8
6
6
6
6
August
5.4
5
6
6
6
September
5.0
5
5
5
6
October
4.8
5
5
5
5
November
4.8
4
5
5
5
December
4.3
4
5
4
4
Average
5.5
5.1
5.5
5.9
6.0
5.8
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
102°
098°
086°
107°
088°
February
098°
069°
083°
069°
105°
March
070°
082°
071°
066°
098°
April
060°
058°
061°
078°
May
082°
068°
091°
024°
June
070°
121°
065°
063°
July
073°
079°
082°
107°
August
054°
060°
071°
076°
September
069°
102°
122°
109°
October
115°
113°
084°
085°
November
124°
095°
084°
088°
December
093°
105°
080°
121°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.