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
99.1
99
99
99
99
99
February
99.2
99
99
99
99
100
March
99.1
100
98
100
99
100
April
97.9
98
99
99
100
May
97.4
97
98
99
96
97
June
96.7
95
99
100
97
95
July
98.7
99
100
100
99
August
98.9
99
100
95
99
September
99.2
99
99
99
96
October
98.2
99
99
99
100
November
99.1
100
100
98
99
December
99.1
100
100
98
Average
98.5
97.9
98.9
99.4
98.0
98.4
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
22.6
22.6
22.6
22.1
21.0
21.8
February
23.1
23.3
23.8
23.6
21.3
22.0
March
21.8
21.6
22.1
23.5
20.3
21.6
April
19.9
20.8
21.0
18.1
19.5
May
17.6
17.3
16.6
18.1
16.6
17.8
June
16.6
16.6
16.6
18.3
15.9
16.3
July
15.8
15.5
18.3
15.3
15.0
August
16.0
15.5
18.5
14.9
15.4
September
16.4
16.1
18.1
15.1
15.3
October
17.2
17.6
18.0
16.1
16.3
November
18.9
19.3
19.1
18.6
17.6
December
20.6
19.6
20.8
21.1
Average
19.0
20.2
18.8
19.9
17.7
18.4
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
18.1
18.1
18.8
17.3
16.1
17.5
February
18.2
18.3
19.8
19.0
16.5
16.5
March
16.8
16.6
17.8
18.3
15.6
16.5
April
15.3
16.8
16.1
13.5
14.8
May
13.8
13.9
13.5
14.5
13.3
13.8
June
12.9
12.8
13.5
14.5
11.4
12.9
July
12.4
11.3
15.0
11.8
12.1
August
12.8
12.0
15.5
12.0
12.3
September
13.2
13.3
14.8
12.0
12.6
October
14.1
14.5
14.9
13.5
14.6
November
15.5
15.9
15.8
15.4
14.6
December
16.7
15.8
17.3
16.8
Average
15.1
15.9
15.2
16.1
13.9
14.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.1
1
0
0
0
May
0.0
0
0
0
0
0
June
0.4
1
0
0
0
0
July
0.1
0
0
0
0
August
0.2
1
1
0
0
September
0.4
1
1
0
3
October
0.7
0
0
0
0
November
0.1
0
0
0
0
December
0.0
0
0
0
Average
0.1
0.2
0.2
0.1
0.1
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
10.0
10
10
11
10
10
February
9.6
9
10
9
10
10
March
9.0
9
9
9
10
10
April
8.4
9
8
8
8
May
8.0
8
8
8
8
8
June
7.8
8
8
7
8
8
July
8.1
8
8
8
8
August
9.0
10
8
9
9
September
9.9
10
10
10
10
October
10.0
10
10
10
9
November
9.9
10
10
9
11
December
10.0
10
10
9
Average
9.1
8.9
9.2
9.2
9.1
9.1
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
198°
199°
195°
195°
197°
February
194°
196°
193°
193°
192°
March
193°
196°
194°
196°
194°
April
197°
195°
197°
194°
May
197°
200°
197°
199°
196°
June
198°
198°
202°
196°
198°
July
199°
201°
202°
199°
August
200°
201°
199°
201°
September
202°
203°
201°
202°
October
202°
199°
201°
201°
November
200°
201°
199°
202°
December
199°
199°
197°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.