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
81.6
82
90
84
89
81
February
80.5
91
68
82
88
84
March
85.4
82
86
88
91
April
90.7
94
91
96
98
May
92.9
89
94
94
98
June
93.2
99
92
95
85
July
93.1
90
94
100
90
August
93.4
93
94
89
96
September
93.7
94
98
99
92
October
90.5
89
94
99
88
November
88.2
87
93
86
95
December
79.3
76
81
85
69
Average
88.9
86.3
88.5
90.8
92.6
89.8
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
7.8
6.7
8.1
8.1
8.3
6.7
February
9.0
7.7
10.9
9.5
10.5
7.5
March
10.8
11.8
9.6
11.8
10.5
April
13.3
13.5
12.5
13.9
11.1
May
16.6
17.5
16.8
16.6
14.4
June
19.8
19.5
22.0
19.5
19.0
July
21.3
20.5
20.3
22.6
20.6
August
21.1
21.1
20.6
23.5
19.8
September
19.3
18.6
21.8
18.8
20.5
October
15.9
15.6
17.1
17.6
16.1
November
11.4
10.9
11.5
13.1
10.8
December
9.0
8.9
10.5
5.0
9.5
Average
13.9
7.2
14.8
15.1
15.4
14.0
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
3.6
3.2
4.4
3.9
3.1
3.7
February
5.3
4.9
8.5
4.4
6.5
5.4
March
7.0
8.4
6.5
7.5
7.0
April
8.8
10.0
8.5
8.3
5.7
May
12.4
13.5
12.1
12.8
10.5
June
15.5
14.8
16.1
15.1
14.5
July
17.5
16.1
16.6
19.3
17.0
August
16.4
16.6
15.9
17.6
15.5
September
13.9
13.6
16.0
14.5
14.8
October
11.1
11.4
12.1
13.5
11.3
November
7.5
7.2
7.0
9.9
6.4
December
5.6
6.5
7.7
0.7
6.5
Average
9.8
4.0
10.9
10.6
11.1
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
12.5
11
9
13
6
18
February
14.2
10
26
6
14
13
March
12.2
17
20
9
8
April
5.7
9
12
5
2
May
5.8
8
4
10
7
June
5.6
2
3
5
11
July
6.6
13
10
1
6
August
7.6
7
10
4
8
September
7.0
13
4
7
3
October
11.2
13
9
4
10
November
11.1
7
20
17
3
December
16.0
14
25
8
14
Average
9.3
10.0
10.8
10.6
7.2
8.0
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
9.7
9
10
11
8
10
February
11.1
9
11
8
14
11
March
11.3
10
11
10
11
April
10.0
11
10
11
10
May
9.9
9
10
10
12
June
10.3
10
11
11
8
July
10.8
10
13
10
10
August
10.4
11
10
9
11
September
10.0
10
9
8
9
October
10.2
8
9
10
11
November
10.1
8
11
12
8
December
10.6
10
12
9
11
Average
10.3
9.4
9.9
10.4
10.1
10.2
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
242°
261°
251°
279°
285°
February
126°
221°
297°
239°
129°
March
205°
222°
089°
245°
April
254°
163°
011°
025°
May
222°
022°
221°
215°
June
252°
035°
206°
219°
July
235°
221°
210°
218°
August
237°
223°
209°
244°
September
314°
195°
278°
209°
October
192°
209°
210°
223°
November
004°
251°
216°
302°
December
292°
229°
005°
244°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.