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
64.0
0
87
74
85
44
February
63.6
0
75
89
87
48
March
66.8
0
70
98
93
91
April
78.9
80
93
92
53
May
62.3
0
68
78
96
58
June
59.4
0
33
92
98
96
July
74.5
20
93
100
79
August
69.3
1
90
99
84
September
69.8
0
89
93
79
October
59.5
0
83
77
75
November
55.2
0
85
83
55
December
62.2
0
85
81
93
Average
63.4
36.2
87.7
91.6
70.8
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
5.2
5.7
8.0
5.4
6.7
2.6
February
7.3
6.7
10.9
8.8
10.3
5.7
March
9.9
11.3
11.1
12.5
10.4
9.4
April
13.4
15.1
15.0
15.0
9.3
May
17.0
19.1
17.1
16.6
21.8
13.8
June
22.7
27.1
22.0
22.6
26.6
21.3
July
25.8
26.6
26.8
29.6
22.3
August
25.6
27.3
27.3
27.3
22.3
September
20.2
19.6
22.5
22.3
19.3
October
15.5
15.0
18.0
17.8
13.9
November
8.4
2.2
10.8
11.1
8.0
December
5.7
4.0
9.8
4.0
5.7
Average
14.3
14.0
14.9
16.4
17.5
11.9
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
1.8
1.7
2.3
2.5
3.2
0.6
February
3.3
2.3
6.2
4.2
4.4
3.3
March
5.6
5.5
5.5
6.5
4.7
6.7
April
8.7
8.0
8.5
8.0
6.7
May
12.0
11.8
10.5
11.8
15.0
10.4
June
17.3
18.8
15.1
16.1
19.1
17.5
July
19.7
19.6
17.0
21.5
19.1
August
20.3
20.3
18.8
20.8
19.8
September
15.4
12.8
16.3
16.1
16.5
October
11.9
11.5
12.9
14.5
10.4
November
5.8
1.1
5.0
8.3
6.0
December
2.8
1.6
4.5
1.3
3.0
Average
10.0
8.1
9.6
10.4
11.8
9.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.0
0
9
3
1
32
February
8.6
0
15
5
1
12
March
8.3
0
15
0
4
1
April
12.2
10
1
4
15
May
13.6
0
14
18
7
27
June
4.3
0
2
7
2
1
July
1.7
0
1
1
9
August
1.6
0
4
1
0
September
3.2
0
3
6
5
October
7.2
0
6
5
8
November
10.1
0
6
6
21
December
9.1
0
4
13
6
Average
8.4
5.4
4.6
3.7
11.2
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
2.8
1
5
3
3
1
February
2.7
3
4
3
3
1
March
3.8
5
6
4
2
1
April
4.6
7
4
4
1
May
4.4
6
6
5
2
2
June
4.0
5
5
3
3
2
July
4.0
5
4
3
3
August
3.3
2
6
3
3
September
2.4
1
4
3
2
October
2.2
3
4
1
2
November
2.6
0
6
2
4
December
2.2
0
5
2
2
Average
3.2
4.2
3.8
4.3
2.6
1.9
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
294°
311°
285°
249°
337°
February
357°
316°
154°
274°
023°
March
013°
356°
285°
014°
067°
April
280°
348°
357°
012°
May
118°
039°
350°
038°
128°
June
108°
133°
052°
009°
002°
July
087°
051°
022°
359°
August
025°
330°
022°
037°
September
257°
056°
023°
005°
October
055°
181°
006°
359°
November
183°
300°
318°
354°
December
183°
256°
315°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.