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
2020
January
66.4
70
57
68
53
80
February
67.4
58
60
69
75
72
March
80.4
66
76
95
79
80
April
87.9
79
88
90
93
94
May
94.4
99
94
94
88
97
June
95.1
96
98
91
97
96
July
94.4
93
91
96
96
93
August
92.4
94
80
95
89
96
September
87.5
88
85
93
88
91
October
78.2
86
89
76
74
74
November
63.9
69
54
46
81
81
December
61.2
71
69
71
51
Average
85.5
85.2
83.1
86.8
85.5
87.7
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
2020
January
-1.2
-4
0
0
-3
4
February
-1.5
-1
1
0
-3
3
March
2.6
3
1
5
3
4
April
8.0
6
10
8
8
7
May
14.7
18
14
14
14
12
June
20.0
20
20
21
23
23
July
21.2
21
20
21
24
19
August
20.2
21
20
22
19
20
September
15.3
18
18
13
13
16
October
9.0
11
6
11
11
11
November
4.1
5
0
4
4
7
December
-1.9
-3
-3
-3
2
Average
9.7
10.7
8.9
9.8
9.1
10.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-6.1
-12
-3
-7
-7
1
February
-7.5
-6
-5
-6
-11
-3
March
-5.6
-3
-7
-3
-3
-2
April
-1.0
-1
-1
-2
-1
0
May
3.9
5
3
3
4
3
June
9.6
10
9
9
12
11
July
11.8
13
11
10
14
10
August
11.2
12
12
12
11
10
September
7.2
9
10
4
5
8
October
2.8
4
1
4
5
5
November
-1.6
1
-4
0
-2
2
December
-5.8
-8
-7
-9
0
Average
2.1
3.0
1.5
1.7
1.5
3.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
29.5
26
29
26
49
15
February
25.9
25
24
22
22
20
March
17.4
15
33
6
17
19
April
12.5
23
5
16
13
10
May
7.0
2
9
5
16
6
June
8.1
9
14
7
4
5
July
9.1
12
14
10
4
14
August
9.5
7
17
11
11
3
September
10.8
10
7
10
8
10
October
18.0
14
12
15
21
22
November
21.3
23
37
19
10
19
December
33.4
38
34
31
32
Average
13.8
13.0
17.0
12.1
13.9
12.0
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
2024
2023
2022
2021
2020
January
7.6
7
8
9
7
10
February
7.9
9
7
8
6
9
March
8.4
6
8
8
10
10
April
8.0
8
7
8
9
10
May
7.7
7
8
8
8
9
June
7.4
7
7
7
7
7
July
6.8
7
6
7
7
7
August
7.2
7
7
7
7
6
September
7.3
6
8
6
8
8
October
7.8
8
8
7
10
8
November
6.9
7
6
7
7
9
December
7.1
6
5
6
8
Average
7.5
7.0
7.2
7.5
7.6
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
2020
January
165°
172°
282°
100°
232°
February
154°
266°
211°
346°
218°
March
136°
277°
267°
275°
240°
April
017°
004°
293°
290°
306°
May
287°
264°
277°
345°
295°
June
224°
296°
250°
269°
258°
July
208°
244°
256°
285°
236°
August
226°
140°
207°
287°
255°
September
183°
207°
034°
340°
228°
October
203°
326°
224°
188°
142°
November
247°
072°
116°
241°
195°
December
097°
115°
073°
133°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.