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
75.1
81
80
65
69
February
87.5
85
67
95
88
March
90.4
92
86
97
86
April
92.6
93
92
93
91
May
93.7
99
91
99
89
June
94.9
92
96
97
95
July
94.1
96
96
95
88
August
94.7
95
90
95
89
September
93.9
94
98
89
93
October
93.1
88
94
97
93
November
86.1
77
87
94
74
December
76.9
69
79
66
77
Average
90.7
90.1
89.5
92.3
87.2
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
4.7
5.2
6.0
4.7
2.9
February
7.4
10.1
7.5
7.4
7.2
March
10.0
11.5
9.4
11.0
8.9
April
13.2
14.3
11.9
11.5
9.8
May
17.9
19.8
17.8
18.6
14.5
June
22.6
20.6
24.1
22.6
23.1
July
23.0
22.8
22.6
23.6
21.6
August
23.5
24.3
22.1
26.0
19.8
September
19.5
19.6
22.8
18.1
19.3
October
15.1
15.1
16.1
17.3
14.0
November
9.1
8.8
8.5
11.0
7.0
December
6.1
6.5
7.4
2.0
5.5
Average
14.4
14.9
14.7
14.9
12.8
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
0.5
0.3
1.9
1.0
0.5
February
1.4
5.4
1.5
1.8
1.0
March
2.6
5.0
2.9
0.2
2.7
April
4.9
6.5
3.2
3.2
2.2
May
8.4
10.8
7.0
8.5
6.5
June
12.5
11.1
12.5
11.4
13.8
July
13.5
13.9
13.6
13.0
13.8
August
14.1
15.5
14.0
14.5
12.4
September
10.7
12.0
13.0
10.5
11.0
October
8.4
8.8
10.1
9.6
5.5
November
3.9
3.2
4.2
5.2
2.7
December
2.1
2.1
3.7
-3.3
1.1
Average
7.0
7.9
7.3
6.6
6.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
21.5
14
22
22
33
February
16.8
15
20
24
16
March
14.7
9
19
5
16
April
9.5
11
11
14
7
May
7.8
5
8
5
18
June
5.5
8
6
4
3
July
8.4
7
9
7
12
August
7.1
7
11
2
12
September
7.7
7
2
12
3
October
11.1
13
13
5
8
November
13.1
12
24
6
21
December
22.9
21
28
18
26
Average
11.0
9.7
12.7
8.9
13.1
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
8.8
10
10
9
7
February
9.5
9
7
13
8
March
8.8
8
9
8
8
April
7.6
8
8
8
7
May
6.4
6
6
6
8
June
6.3
6
6
6
5
July
6.4
6
8
6
6
August
6.3
6
6
6
6
September
6.5
7
6
6
6
October
8.2
7
9
8
9
November
8.0
8
10
8
7
December
8.6
8
10
5
8
Average
7.4
7.1
7.6
7.1
6.9
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
234°
220°
246°
223°
February
223°
246°
229°
159°
March
191°
226°
107°
242°
April
232°
132°
172°
276°
May
140°
056°
240°
228°
June
246°
062°
249°
227°
July
232°
227°
264°
225°
August
224°
230°
138°
245°
September
177°
174°
215°
209°
October
186°
214°
198°
198°
November
210°
224°
186°
229°
December
230°
234°
135°
202°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.