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
86.7
98
74
90
76
94
February
91.9
95
85
90
95
95
March
96.7
100
99
100
91
99
April
99.2
100
100
100
99
May
99.7
100
100
100
100
June
99.9
100
100
100
100
July
99.9
100
100
100
100
August
99.9
100
100
100
100
September
99.8
100
100
100
100
October
98.9
100
100
100
100
November
91.5
95
92
88
88
December
83.8
86
77
88
90
Average
96.4
97.6
95.6
96.3
95.6
97.4
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
9.5
12.4
9.9
10.5
6.7
10.9
February
11.3
9.0
12.8
10.0
12.8
13.8
March
15.5
19.5
15.5
16.3
10.0
14.5
April
21.3
25.0
19.5
23.8
22.3
May
26.7
25.5
25.8
25.5
30.5
June
32.6
37.1
31.5
32.1
31.5
July
36.7
37.0
37.5
36.3
36.7
August
36.6
37.2
38.5
36.5
36.6
September
32.6
31.6
33.0
32.8
30.6
October
25.7
25.3
26.0
25.8
25.1
November
17.1
16.1
18.1
16.8
18.8
December
12.1
11.0
13.6
14.0
10.9
Average
22.2
13.7
23.6
23.4
23.1
23.5
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
0.8
0.2
3.7
0.7
-1.0
2.0
February
1.0
-1.1
3.6
-1.0
2.6
2.2
March
4.5
5.5
4.4
6.2
1.3
3.3
April
8.2
10.6
7.7
9.3
8.8
May
12.2
12.5
10.9
12.6
14.1
June
17.7
21.3
17.8
17.6
17.5
July
22.3
23.8
23.3
22.3
23.1
August
21.7
22.6
23.3
21.1
21.8
September
17.1
17.6
17.8
17.6
15.9
October
11.2
9.9
12.9
12.4
10.9
November
5.9
4.7
7.5
7.5
6.2
December
3.1
2.0
3.7
5.2
2.2
Average
9.6
1.7
11.4
11.0
10.9
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
10.9
1
19
8
15
8
February
8.1
9
7
9
5
1
March
9.7
3
11
10
22
11
April
3.5
3
6
1
2
May
1.7
3
3
2
0
June
0.1
0
1
1
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.1
0
1
0
0
October
0.9
0
1
1
1
November
5.8
4
4
9
6
December
9.5
8
5
5
8
Average
3.9
4.3
4.1
3.5
4.6
2.7
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
5.3
5
5
4
6
4
February
5.5
7
5
5
6
4
March
6.7
7
7
7
6
6
April
5.7
7
6
6
4
May
6.2
8
6
6
5
June
7.1
7
7
7
7
July
7.2
9
8
7
7
August
5.9
7
6
6
4
September
5.0
6
5
5
4
October
4.3
6
4
4
3
November
3.7
5
4
4
1
December
4.4
6
4
3
2
Average
5.7
6.2
6.6
5.7
5.7
4.5
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
023°
045°
055°
024°
059°
February
011°
091°
007°
028°
041°
March
086°
239°
280°
292°
248°
April
044°
219°
264°
256°
May
263°
269°
300°
282°
June
317°
268°
261°
267°
July
299°
325°
295°
290°
August
278°
281°
238°
279°
September
249°
237°
249°
267°
October
316°
270°
001°
304°
November
064°
061°
056°
015°
December
046°
069°
075°
071°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.