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
89.0
80
92
91
91
90
February
85.0
72
82
93
81
March
81.0
78
81
87
80
April
87.9
90
85
94
98
May
76.3
81
70
97
81
June
89.6
97
97
88
94
July
85.3
88
90
97
83
August
83.2
99
96
97
97
September
91.2
87
95
97
94
October
89.6
85
88
94
92
November
88.9
86
87
90
96
December
83.3
78
90
97
80
Average
84.8
80.4
87.0
87.5
93.5
89.0
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
7.3
7.2
6.9
7.5
8.0
6.5
February
6.8
8.0
7.5
5.7
5.5
March
6.7
8.0
7.0
3.9
6.9
April
8.2
9.4
8.1
6.5
7.2
May
11.0
13.0
10.5
9.3
9.9
June
14.5
14.4
15.6
13.0
14.5
July
16.9
16.3
16.8
17.1
17.1
August
17.9
18.3
17.1
19.1
17.1
September
16.5
16.6
18.1
16.6
17.1
October
14.2
14.1
14.1
15.3
14.8
November
11.1
11.0
10.5
12.5
11.1
December
8.8
9.5
9.3
7.7
8.6
Average
11.1
7.2
12.1
11.9
11.3
11.4
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
5.4
5.0
4.7
5.7
6.0
4.7
February
4.8
6.2
5.7
3.7
3.3
March
5.0
6.4
4.7
2.7
5.2
April
6.3
7.4
6.5
4.2
5.2
May
9.3
11.4
8.6
7.7
8.1
June
12.8
12.9
14.0
10.8
13.1
July
14.9
14.9
15.0
12.6
15.6
August
16.2
16.3
15.8
17.5
15.6
September
14.7
14.8
16.1
15.1
15.5
October
12.0
12.5
11.4
13.5
12.9
November
8.8
8.5
7.9
9.6
9.5
December
6.7
7.5
7.0
6.0
6.5
Average
9.2
5.1
10.3
9.9
9.3
9.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
10.1
17
13
9
8
12
February
14.4
22
10
11
15
March
10.7
12
16
3
21
April
6.9
13
11
5
3
May
8.2
6
12
8
10
June
7.0
6
3
9
6
July
6.4
9
14
6
3
August
5.7
5
10
2
5
September
7.5
8
6
10
5
October
11.0
4
19
7
8
November
11.2
12
19
13
3
December
12.2
10
16
12
17
Average
9.6
17.1
9.2
11.3
7.2
8.2
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
20.8
20
23
22
21
19
February
21.6
20
19
24
23
March
19.1
19
20
16
19
April
16.9
21
16
12
16
May
15.0
15
14
14
15
June
14.6
15
14
14
13
July
15.1
15
17
15
13
August
15.5
16
15
13
16
September
17.0
18
15
18
16
October
20.4
18
19
20
23
November
20.0
19
21
22
20
December
20.4
18
23
18
19
Average
17.7
19.6
17.6
17.2
16.4
16.8
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
234°
264°
256°
274°
290°
February
229°
281°
241°
150°
March
169°
253°
081°
261°
April
249°
123°
360°
345°
May
120°
020°
224°
258°
June
266°
059°
206°
321°
July
244°
239°
269°
270°
August
216°
272°
219°
314°
September
039°
195°
348°
218°
October
199°
213°
224°
227°
November
288°
250°
189°
292°
December
261°
226°
352°
232°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.