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
70.9
64
87
76
74
66
February
84.9
84
74
86
93
89
March
92.8
94
94
97
95
96
April
94.6
98
89
93
96
May
93.2
87
91
98
97
June
94.3
94
99
97
92
July
97.2
96
97
99
95
August
97.1
98
95
99
98
September
94.8
91
97
98
93
October
88.1
74
94
92
91
November
78.9
70
83
78
75
December
71.7
70
77
58
67
Average
89.2
81.8
87.6
91.4
92.4
89.6
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
7.0
6.7
7.0
8.0
7.0
6.5
February
9.7
7.5
11.3
10.0
11.0
9.5
March
13.0
13.8
13.4
12.5
14.0
12.8
April
16.1
16.0
14.1
15.8
13.6
May
19.7
19.0
19.5
21.6
16.6
June
24.1
21.8
26.6
24.3
23.6
July
26.0
25.1
25.0
27.8
23.5
August
25.7
26.5
24.1
28.3
22.8
September
22.1
19.8
25.6
21.1
23.1
October
17.4
16.6
19.3
19.6
16.6
November
11.1
10.6
11.5
12.5
9.8
December
8.2
7.9
9.5
3.7
8.9
Average
15.9
9.4
16.2
17.2
17.7
15.6
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
2.3
1.3
1.8
3.9
1.9
2.0
February
3.4
2.1
6.7
3.0
4.0
3.2
March
5.0
4.7
6.5
5.5
5.0
3.3
April
6.6
7.7
6.0
6.0
3.6
May
10.1
11.5
9.8
11.0
8.5
June
14.2
12.8
15.3
14.1
14.5
July
15.7
15.6
15.8
15.5
15.5
August
15.7
16.1
15.8
16.5
14.5
September
12.9
12.8
15.6
12.5
13.5
October
10.3
10.8
11.0
12.3
8.0
November
5.6
5.5
6.5
7.0
3.7
December
3.8
3.7
5.5
-1.9
4.4
Average
8.2
2.7
9.3
9.5
9.1
7.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
20.6
24
14
21
10
31
February
17.5
10
35
6
17
15
March
14.9
7
19
18
9
10
April
11.7
21
15
13
8
May
12.6
22
11
4
23
June
9.8
13
3
9
14
July
7.1
9
11
2
14
August
7.0
7
11
3
9
September
10.7
21
7
13
9
October
13.4
18
13
11
10
November
19.4
16
35
19
17
December
21.5
25
24
6
19
Average
13.0
13.0
17.6
13.4
9.0
14.3
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
9.6
10
10
12
8
9
February
10.7
9
11
9
12
11
March
10.5
9
10
13
9
10
April
9.3
11
10
10
9
May
8.5
8
10
8
11
June
7.8
8
8
7
7
July
8.2
7
10
7
9
August
7.9
8
9
8
9
September
8.2
10
7
8
7
October
9.3
8
9
9
9
November
9.5
9
12
10
8
December
10.0
9
11
7
9
Average
9.0
9.1
8.8
9.7
8.5
8.8
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
195°
237°
235°
234°
250°
February
128°
217°
360°
234°
143°
March
058°
200°
234°
084°
295°
April
240°
352°
027°
020°
May
250°
014°
328°
233°
June
309°
028°
308°
358°
July
264°
241°
348°
270°
August
253°
255°
029°
292°
September
225°
179°
249°
080°
October
140°
208°
193°
208°
November
158°
224°
201°
306°
December
246°
225°
059°
222°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.