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
81.2
81
78
88
75
78
February
85.0
86
79
86
79
84
March
92.0
93
93
88
96
97
April
95.1
98
93
91
99
May
95.0
93
90
97
98
96
June
95.0
98
95
96
98
94
July
96.7
98
95
98
97
August
96.6
95
95
97
98
September
96.3
96
98
96
98
October
88.7
75
93
90
93
November
90.0
74
93
96
87
December
77.9
81
67
90
70
Average
91.8
91.3
88.9
91.8
92.9
92.1
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
9.4
10.1
9.9
9.6
8.3
8.3
February
11.5
11.5
12.5
10.8
11.8
11.5
March
13.8
14.0
14.0
13.1
15.3
13.8
April
16.7
16.3
15.9
16.3
16.8
May
20.0
20.3
18.1
21.3
22.8
17.6
June
23.6
25.8
21.6
25.8
23.8
23.3
July
25.0
23.8
23.6
27.8
23.3
August
25.0
25.0
24.6
28.1
22.8
September
23.0
20.3
26.1
23.0
24.3
October
19.1
18.3
21.1
20.8
18.6
November
13.7
14.9
14.0
15.4
11.5
December
10.6
10.6
11.5
6.9
10.5
Average
17.5
16.4
17.1
18.2
18.8
16.9
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
4.2
3.7
4.9
5.0
3.2
3.2
February
5.4
4.7
7.9
3.2
5.7
5.9
March
6.9
6.5
7.7
7.5
7.0
5.5
April
8.2
9.0
8.0
8.4
6.2
May
11.6
12.0
12.1
11.8
12.6
10.6
June
15.7
17.1
14.5
16.8
16.1
15.6
July
16.9
16.6
17.0
17.1
16.8
August
16.7
16.5
17.3
18.3
15.5
September
14.5
13.5
17.5
14.1
15.4
October
12.0
12.4
12.9
14.5
9.9
November
7.6
8.0
9.1
9.9
5.0
December
5.8
5.5
7.2
1.6
5.5
Average
10.3
8.8
10.7
11.2
11.0
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
29.9
41
20
35
16
29
February
23.6
25
33
11
16
27
March
24.4
23
35
28
16
10
April
16.8
22
26
15
6
May
19.3
23
44
18
6
23
June
14.9
11
16
12
16
19
July
9.7
10
16
2
22
August
11.5
12
14
10
16
September
17.1
31
15
26
19
October
24.8
25
31
25
19
November
27.0
11
44
41
19
December
29.2
22
27
16
27
Average
19.8
23.2
23.4
21.7
15.8
19.1
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
12
10
11
8
11
February
10.4
9
11
10
10
12
March
10.8
10
10
11
10
10
April
9.9
10
11
11
11
May
10.2
9
10
11
10
12
June
9.5
10
10
9
9
9
July
10.2
10
11
11
11
August
9.7
9
11
10
11
September
9.6
11
8
10
9
October
9.7
9
11
10
10
November
10.2
10
13
11
9
December
10.5
10
11
11
11
Average
10.0
9.6
9.8
10.4
10.0
10.4
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
183°
132°
265°
031°
261°
February
115°
233°
054°
244°
131°
March
084°
217°
230°
117°
327°
April
272°
303°
310°
040°
May
314°
258°
014°
322°
257°
June
284°
303°
316°
286°
285°
July
290°
270°
339°
287°
August
292°
290°
336°
312°
September
281°
217°
294°
305°
October
133°
213°
189°
173°
November
104°
256°
234°
012°
December
332°
234°
077°
195°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.