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
72.0
86
80
71
72
February
80.2
72
84
87
76
March
86.8
83
88
89
90
April
93.7
96
89
96
96
May
93.7
92
92
96
93
June
92.6
93
96
97
85
July
93.5
96
94
96
87
August
94.7
96
93
96
92
September
90.4
94
95
93
87
October
86.3
85
87
89
83
November
73.9
66
81
80
67
December
61.7
57
62
60
59
Average
87.4
87.1
88.2
90.5
84.5
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
6.0
5.5
7.2
7.0
4.9
February
7.6
9.4
8.5
8.9
6.0
March
10.2
11.4
9.5
11.8
9.5
April
13.5
14.0
12.5
12.8
10.0
May
17.9
20.6
17.0
18.1
14.4
June
21.6
19.5
23.6
21.1
22.0
July
22.3
21.8
22.0
22.5
22.0
August
23.1
23.8
21.6
25.0
20.3
September
19.5
20.0
22.3
19.1
20.1
October
15.1
15.3
15.0
16.3
14.5
November
9.5
9.0
9.6
10.3
9.5
December
6.8
7.7
7.7
3.2
6.5
Average
14.5
14.8
14.7
15.1
13.3
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
1.0
0.4
2.6
2.6
-1.8
February
1.3
4.5
1.3
2.3
-1.4
March
2.1
4.4
2.7
0.1
1.5
April
3.5
5.5
2.9
3.6
0.4
May
7.3
9.9
7.5
6.7
5.7
June
11.2
10.0
11.5
9.6
11.3
July
12.0
12.4
11.5
11.4
13.4
August
12.4
13.0
11.5
12.4
12.9
September
9.7
10.5
11.4
8.5
10.5
October
7.9
7.2
9.0
8.5
7.5
November
3.8
3.7
4.0
4.7
4.7
December
2.4
3.5
3.5
-3.7
1.1
Average
6.3
7.0
6.6
5.9
5.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
24.6
22
23
15
26
February
21.7
25
14
33
16
March
16.9
10
28
7
18
April
15.6
26
19
16
21
May
12.4
12
8
11
34
June
13.0
21
5
12
7
July
15.4
20
22
10
16
August
14.2
10
22
2
20
September
18.8
17
12
28
10
October
23.8
14
24
20
26
November
26.7
31
42
19
23
December
25.4
28
26
20
20
Average
17.8
18.7
18.9
14.8
19.2
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
9.8
11
11
10
8
February
10.6
10
9
14
9
March
9.9
9
11
7
10
April
9.2
10
9
10
9
May
8.0
7
8
8
9
June
7.6
8
8
7
7
July
7.8
8
9
8
7
August
7.5
7
7
7
8
September
7.4
8
7
7
6
October
8.9
8
9
9
9
November
8.6
8
10
10
8
December
9.1
11
10
7
8
Average
8.5
8.5
8.8
8.3
8.1
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
233°
229°
254°
224°
February
220°
267°
239°
140°
March
185°
239°
081°
258°
April
233°
063°
013°
335°
May
095°
016°
268°
247°
June
256°
011°
267°
335°
July
243°
236°
277°
271°
August
229°
245°
358°
275°
September
177°
189°
251°
216°
October
190°
215°
209°
208°
November
216°
213°
187°
225°
December
229°
232°
152°
209°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.