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
78.5
83
74
84
67
83
February
85.4
87
76
91
83
87
March
93.6
95
94
92
94
96
April
94.9
98
95
90
98
May
94.0
96
94
94
97
96
June
95.2
98
94
95
96
93
July
96.7
95
97
98
92
August
96.8
97
96
99
94
September
92.7
91
95
92
88
October
88.9
84
96
97
90
November
85.4
86
88
85
81
December
77.0
71
74
83
83
Average
91.2
92.7
89.0
92.1
91.4
90.9
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
9.7
10.5
10.4
9.1
8.6
8.8
February
13.3
14.0
12.9
13.3
13.5
14.5
March
15.7
16.3
16.0
16.0
16.0
15.9
April
18.9
19.0
18.8
17.6
18.3
May
22.3
23.1
20.1
23.0
25.5
20.1
June
26.5
28.8
24.8
27.8
27.6
26.1
July
28.7
28.8
28.1
31.1
26.0
August
28.9
29.3
29.1
32.0
26.3
September
25.4
21.8
29.3
25.8
25.5
October
20.8
20.6
23.0
23.6
19.8
November
14.3
16.6
14.3
15.6
11.5
December
10.7
9.9
11.0
9.5
12.1
Average
19.5
18.5
19.2
20.2
20.9
18.8
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
1.6
1.9
2.5
2.6
-1.3
1.1
February
2.0
1.8
4.9
-2.5
1.7
5.4
March
3.9
3.7
5.2
5.0
4.2
2.2
April
5.7
6.5
6.0
5.9
3.3
May
9.3
9.1
9.6
9.5
10.4
7.5
June
13.9
14.8
13.5
15.0
14.1
13.6
July
14.8
14.8
14.8
14.0
14.0
August
14.3
14.4
15.5
15.5
11.6
September
11.3
11.0
13.5
11.1
12.5
October
9.3
10.5
9.8
12.3
6.0
November
4.4
5.4
6.7
5.2
3.1
December
2.7
2.5
4.5
-1.7
1.7
Average
7.6
6.3
8.4
8.5
8.1
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
28.3
38
25
26
18
28
February
22.2
24
20
10
31
27
March
25.4
19
33
25
22
14
April
19.3
29
29
20
10
May
23.7
17
47
26
8
31
June
14.5
11
27
14
18
16
July
8.7
11
15
2
19
August
9.7
9
11
11
13
September
18.1
34
8
16
30
October
21.2
27
25
13
19
November
29.1
21
52
38
26
December
29.8
18
39
18
30
Average
19.9
20.2
25.2
22.1
16.8
21.2
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
5.8
7
5
6
4
7
February
6.2
5
6
5
6
8
March
7.1
7
7
7
7
7
April
6.2
7
6
7
6
May
5.5
5
6
6
5
7
June
5.2
5
5
5
6
5
July
5.5
6
6
6
6
August
5.2
5
6
5
5
September
5.4
6
6
6
5
October
5.7
5
6
6
5
November
5.6
5
7
6
5
December
5.7
6
6
5
6
Average
5.7
5.6
5.7
6.0
5.7
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
204°
135°
253°
285°
263°
February
153°
222°
026°
259°
153°
March
101°
210°
242°
126°
299°
April
268°
285°
278°
027°
May
298°
258°
326°
311°
257°
June
285°
285°
327°
303°
284°
July
284°
280°
342°
292°
August
291°
283°
321°
307°
September
269°
148°
279°
327°
October
182°
187°
149°
143°
November
181°
245°
204°
300°
December
310°
237°
057°
241°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.