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
2024
2023
2022
2021
January
73.9
72
90
77
87
February
77.6
67
82
89
75
March
79.2
76
71
86
80
April
89.8
89
86
94
98
May
77.9
82
68
91
72
June
76.7
95
85
86
84
July
71.3
83
83
93
89
August
60.3
95
0
97
96
September
72.8
89
83
83
91
October
75.6
79
78
94
89
November
76.5
83
80
87
95
December
75.4
62
36
95
78
Average
75.4
83.1
69.6
89.6
86.1
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
2024
2023
2022
2021
January
6.3
6.7
8.0
8.0
6.0
February
6.0
7.5
7.5
7.7
4.9
March
6.1
7.5
7.0
7.4
6.5
April
8.2
9.3
8.3
8.3
6.7
May
11.5
13.9
10.3
11.9
9.6
June
15.2
14.5
16.0
14.8
14.8
July
17.1
16.8
16.6
17.1
17.3
August
18.3
18.6
17.3
19.0
17.1
September
16.1
16.6
18.3
16.5
17.1
October
13.3
14.3
14.3
15.3
14.4
November
10.7
10.9
10.8
12.3
11.1
December
7.7
9.6
8.6
7.5
8.5
Average
11.4
12.2
11.9
12.3
11.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
4.1
3.7
5.9
5.7
4.2
February
3.0
6.0
6.0
5.2
2.7
March
4.3
6.0
4.5
5.5
4.7
April
6.2
7.0
6.5
6.2
4.9
May
9.3
11.5
8.3
10.0
7.7
June
13.0
12.8
14.0
13.0
12.5
July
14.8
14.5
15.0
15.0
15.3
August
16.3
16.3
15.6
17.3
15.6
September
14.0
14.0
16.3
14.6
15.5
October
9.2
12.1
11.8
13.0
12.4
November
7.8
8.5
7.5
10.3
9.1
December
4.2
7.0
6.2
5.2
6.2
Average
8.9
10.0
9.8
10.3
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
4.1
3
9
0
1
February
9.8
18
4
0
19
March
10.5
11
16
2
12
April
5.7
11
6
6
3
May
7.5
3
10
6
12
June
5.2
5
3
5
8
July
5.1
9
10
5
4
August
2.6
5
0
2
4
September
6.6
10
8
6
5
October
10.4
8
17
6
13
November
12.6
8
21
12
10
December
7.7
8
7
10
5
Average
6.9
7.9
8.6
4.7
7.7
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
2024
2023
2022
2021
January
19.3
25
24
24
0
February
19.9
21
19
29
0
March
17.2
20
20
15
0
April
14.5
20
16
16
0
May
11.5
16
14
16
0
June
11.5
16
13
14
1
July
13.0
16
18
17
8
August
13.8
17
15
13
15
September
15.1
17
16
18
15
October
18.7
19
22
21
23
November
18.4
19
22
24
20
December
17.2
7
24
18
20
Average
15.1
17.6
17.7
17.7
7.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
256°
242°
272°
360°
February
231°
261°
246°
360°
March
157°
239°
117°
344°
April
220°
105°
338°
346°
May
114°
022°
242°
204°
June
255°
008°
240°
359°
July
246°
243°
265°
295°
August
229°
261°
220°
278°
September
076°
213°
354°
238°
October
207°
239°
222°
219°
November
259°
222°
188°
272°
December
232°
242°
018°
224°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.