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
78.8
70
86
88
73
74
February
85.2
84
81
77
92
86
March
87.3
90
81
86
89
88
April
89.6
93
86
93
92
May
89.0
96
80
82
92
94
June
91.7
99
92
94
95
85
July
94.3
95
93
97
93
August
93.0
90
91
92
97
September
91.4
89
89
93
92
October
89.8
84
90
93
92
November
79.4
74
82
74
86
December
77.0
73
74
85
69
Average
88.5
89.6
85.8
86.6
90.0
88.8
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
7.0
6.2
7.0
8.4
7.7
6.0
February
8.8
7.0
11.0
9.0
10.0
7.4
March
11.1
12.3
12.0
10.4
12.5
10.3
April
13.4
13.9
12.0
13.4
9.6
May
16.6
17.3
17.3
14.6
17.5
14.5
June
20.5
22.1
18.3
22.3
20.5
20.1
July
21.8
21.0
21.6
23.3
20.6
August
22.2
22.8
20.8
24.5
19.8
September
19.7
18.8
22.8
19.3
20.8
October
16.0
15.6
17.5
17.6
15.3
November
10.7
10.4
10.9
11.8
10.3
December
8.4
8.8
9.8
4.5
8.6
Average
14.5
13.1
14.7
15.0
15.6
13.7
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
2.4
1.3
1.9
3.7
2.7
1.8
February
3.0
1.3
6.4
2.7
4.4
1.5
March
4.1
2.3
6.0
4.5
3.3
3.5
April
5.4
7.2
4.7
5.7
2.7
May
8.6
9.8
10.0
7.5
9.1
7.0
June
12.3
12.6
11.5
13.8
11.5
12.8
July
13.5
13.5
13.5
13.5
13.8
August
14.0
14.6
13.4
15.1
13.6
September
11.7
12.5
13.5
12.0
12.0
October
9.3
9.0
9.9
10.3
8.3
November
5.6
5.9
6.5
6.0
5.7
December
3.8
4.4
5.0
-1.6
4.7
Average
7.6
5.5
8.6
8.3
8.1
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
13.3
15
14
17
9
21
February
14.0
15
22
6
13
15
March
11.3
1
18
24
7
6
April
7.7
11
15
10
4
May
5.8
4
13
7
5
9
June
5.6
3
8
2
11
9
July
7.0
13
11
1
6
August
6.3
8
7
3
6
September
9.3
12
9
14
2
October
12.0
11
13
8
17
November
15.1
10
25
20
17
December
15.7
17
23
10
14
Average
9.1
6.6
12.8
12.1
8.6
9.4
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
9.6
8
10
9
8
10
February
11.0
8
11
8
14
11
March
10.4
8
9
11
8
11
April
9.7
12
9
10
11
May
9.2
10
8
10
8
10
June
8.6
9
9
9
8
7
July
8.3
8
9
8
7
August
8.0
7
8
8
9
September
8.5
9
7
8
7
October
9.3
7
8
8
9
November
9.2
8
11
9
8
December
10.4
10
12
6
10
Average
9.2
8.8
8.8
9.3
8.6
8.9
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
207°
243°
237°
259°
276°
February
135°
217°
259°
241°
153°
March
041°
201°
242°
071°
291°
April
262°
358°
018°
008°
May
348°
294°
011°
293°
262°
June
248°
303°
016°
316°
351°
July
265°
245°
316°
304°
August
244°
271°
002°
305°
September
267°
192°
308°
229°
October
168°
210°
207°
220°
November
246°
222°
187°
275°
December
245°
228°
162°
234°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.