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
January
46.8
48
42
51
February
62.2
70
48
74
March
57.7
63
52
73
April
62.2
50
76
May
81.3
84
78
June
84.2
84
84
July
76.1
79
74
August
76.4
89
62
September
70.0
70
70
October
48.9
37
73
November
52.6
55
50
December
35.2
46
22
Average
60.4
61.0
57.3
63.0
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
January
3.6
3
4
4
February
6.6
8
6
6
March
7.3
8
7
7
April
8.9
9
10
May
17.1
17
18
June
22.3
22
23
July
22.1
24
21
August
23.8
23
25
September
16.3
19
14
October
14.0
14
15
November
6.7
6
7
December
1.7
4
-1
Average
10.3
6.3
12.3
12.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
1.9
1
3
2
February
4.1
5
3
4
March
4.5
5
4
4
April
7.1
7
7
May
15.5
16
16
June
20.7
21
21
July
20.6
22
19
August
20.6
20
22
September
13.4
16
11
October
11.4
11
12
November
4.7
5
5
December
0.1
2
-2
Average
8.0
3.8
10.3
9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
51.4
48
64
41
February
48.0
41
55
48
March
46.3
18
70
5
April
43.3
40
48
May
20.9
12
33
June
14.4
13
16
July
20.8
14
26
August
30.3
42
17
September
12.8
0
19
October
37.7
48
18
November
38.7
53
18
December
49.0
54
44
Average
37.4
37.0
45.9
29.4
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
2024
2023
2022
January
8.4
9
8
8
February
10.5
10
9
13
March
6.8
6
8
5
April
7.3
6
9
May
7.5
8
8
June
6.6
7
7
July
7.5
9
6
August
6.0
6
7
September
4.9
4
6
October
5.6
6
6
November
6.3
7
5
December
6.1
8
4
Average
7.6
8.8
7.1
7.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
235°
267°
254°
February
255°
270°
253°
March
230°
261°
026°
April
015°
276°
May
344°
271°
June
303°
289°
July
252°
274°
August
253°
319°
September
177°
250°
October
241°
219°
November
249°
113°
December
245°
007°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.