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
95.7
99
98
95
94
93
February
95.7
97
98
94
97
98
March
97.2
100
95
97
96
98
April
96.8
96
94
98
99
May
97.4
98
93
99
97
99
June
94.3
92
99
89
94
94
July
98.2
92
100
100
100
August
96.8
95
100
95
100
September
97.0
96
98
94
98
October
96.5
96
97
99
95
November
96.2
91
97
97
98
December
96.0
94
98
91
98
Average
96.5
97.2
95.0
96.5
96.2
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
31.8
33.3
33.0
30.1
31.5
30.8
February
31.8
33.2
33.1
29.6
32.7
31.6
March
31.9
33.5
32.7
31.1
31.1
32.0
April
30.1
31.8
28.3
30.1
30.1
May
27.9
28.1
29.8
27.6
25.6
28.8
June
26.7
25.3
30.6
25.3
26.0
25.3
July
27.7
28.3
27.5
29.3
26.1
August
28.6
30.1
30.3
26.6
30.3
September
32.2
35.1
33.7
26.3
33.3
October
31.4
33.2
32.2
29.5
29.1
November
32.0
33.1
33.1
29.8
32.6
December
32.0
31.6
33.8
30.1
32.8
Average
30.3
30.7
31.8
30.2
29.0
30.2
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
21.6
20.8
21.8
21.0
21.5
22.0
February
21.4
21.6
22.5
21.1
21.6
20.3
March
21.4
21.8
22.5
21.1
21.8
21.0
April
19.0
21.5
18.6
19.1
17.8
May
16.7
16.8
18.5
16.5
14.6
16.3
June
16.0
15.0
17.8
14.6
15.0
15.0
July
15.0
15.5
15.5
16.5
11.5
August
15.9
15.3
17.5
15.3
17.1
September
18.9
20.0
20.1
16.1
19.8
October
19.8
20.5
21.3
19.1
18.6
November
20.1
21.6
21.3
17.3
20.1
December
21.3
21.3
22.0
21.1
20.6
Average
18.9
19.2
19.8
19.2
18.1
18.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.6
2
1
6
6
7
February
3.7
3
2
7
3
2
March
2.7
3
2
3
4
4
April
2.0
3
3
3
0
May
1.6
2
3
2
1
1
June
2.8
3
0
7
0
4
July
0.6
3
0
0
0
August
3.1
4
0
6
0
September
2.3
1
1
6
1
October
3.1
2
4
3
6
November
2.4
4
3
2
3
December
3.5
5
1
7
2
Average
2.8
2.5
2.5
3.0
3.4
2.5
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
6.3
6
6
7
6
6
February
6.1
6
6
6
6
6
March
6.1
6
6
6
6
5
April
6.5
6
6
7
7
May
6.6
7
6
6
7
7
June
6.9
7
7
6
7
6
July
7.3
6
7
8
8
August
8.2
7
7
9
9
September
7.9
8
8
9
8
October
7.8
8
8
8
8
November
7.8
7
7
9
8
December
6.6
6
6
7
8
Average
6.9
6.4
6.6
6.6
7.4
7.0
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
056°
089°
085°
073°
059°
February
050°
059°
014°
088°
146°
March
088°
095°
061°
057°
035°
April
068°
098°
094°
110°
May
075°
013°
083°
060°
101°
June
057°
033°
059°
090°
090°
July
079°
078°
049°
103°
August
059°
072°
091°
078°
September
066°
048°
104°
087°
October
098°
077°
091°
110°
November
078°
060°
120°
112°
December
094°
110°
092°
098°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.