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
97.8
94
100
97
100
100
February
97.1
99
90
99
99
98
March
98.4
98
98
100
98
96
April
97.9
99
99
98
100
May
96.2
95
95
97
95
96
June
98.8
90
100
98
100
100
July
98.1
100
99
95
98
August
99.9
100
100
100
100
September
99.5
99
100
100
100
October
98.7
100
94
100
100
November
97.9
100
99
100
92
December
97.8
100
99
96
100
Average
98.0
95.5
98.3
98.4
98.2
98.3
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
13.3
10.5
16.8
9.0
13.5
13.8
February
16.2
14.5
14.9
17.5
17.6
18.5
March
20.5
19.5
18.8
21.1
23.6
23.8
April
24.9
21.1
24.6
27.8
26.8
May
30.3
33.6
30.1
30.5
30.6
29.3
June
35.7
34.6
34.5
36.1
35.2
36.2
July
36.6
40.2
37.2
36.1
36.1
August
34.4
37.3
34.0
32.2
33.7
September
32.1
32.8
33.0
32.0
33.0
October
26.4
27.1
27.6
27.3
26.3
November
19.6
23.0
20.6
20.1
17.8
December
15.6
14.1
18.0
12.9
16.8
Average
25.2
21.8
25.9
25.8
26.2
26.0
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
-3.5
-4.5
0.2
-3.1
-2.5
-7.9
February
0.4
0.8
-2.1
3.5
0.3
0.0
March
4.8
4.2
4.5
5.4
7.2
6.4
April
9.3
8.4
8.0
10.3
9.9
May
13.3
16.0
13.6
13.1
12.5
12.5
June
18.4
18.8
18.3
19.6
17.6
17.8
July
20.0
23.8
20.6
19.5
20.3
August
16.9
20.1
16.6
14.4
17.6
September
12.6
13.3
14.9
12.4
13.3
October
8.1
10.5
10.3
7.5
7.5
November
2.8
4.9
4.5
4.0
3.2
December
-3.9
-5.5
-2.5
0.2
-1.5
Average
8.3
6.6
9.3
9.3
9.0
8.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.6
3
0
5
4
0
February
3.2
4
5
4
2
1
March
1.5
2
3
0
0
1
April
1.2
2
0
0
0
May
0.5
0
3
0
0
0
June
0.0
0
0
0
0
0
July
0.1
0
0
1
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.2
0
0
0
0
November
0.8
0
0
0
1
December
1.5
2
0
3
1
Average
1.0
1.7
1.1
0.7
0.5
0.3
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
4
6
5
7
5
February
7.3
8
7
9
7
6
March
7.9
6
8
7
9
10
April
7.7
7
7
8
8
May
7.6
7
9
8
8
7
June
7.7
8
8
7
8
8
July
7.7
8
8
8
8
August
7.7
8
8
8
8
September
6.3
6
6
6
6
October
6.0
7
6
6
6
November
5.0
5
5
6
5
December
4.5
4
5
4
5
Average
6.9
6.7
7.1
7.0
7.2
6.8
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
311°
249°
280°
244°
288°
February
240°
267°
246°
252°
271°
March
268°
249°
257°
250°
258°
April
308°
264°
262°
305°
May
337°
271°
300°
308°
320°
June
018°
360°
289°
346°
353°
July
039°
023°
021°
013°
August
032°
347°
355°
005°
September
345°
006°
360°
008°
October
289°
297°
341°
327°
November
276°
251°
267°
309°
December
294°
289°
329°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.