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
62.5
57
68
62
February
75.3
82
63
83
March
73.6
82
65
75
April
83.1
88
79
May
81.7
85
79
June
96.2
94
100
July
79.0
77
81
August
69.3
62
84
September
58.0
59
58
October
61.9
70
57
November
67.8
69
66
December
48.0
64
26
Average
71.2
74.8
69.6
69.2
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
January
3.4
2
5
4
February
7.1
9
5
7
March
8.0
9
7
8
April
11.1
10
12
May
17.7
16
20
June
22.6
22
23
July
21.0
20
22
August
23.3
21
26
September
16.3
17
15
October
14.1
14
14
November
7.3
7
8
December
2.6
5
-1
Average
10.7
6.6
12.3
13.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
1.5
0
3
2
February
5.0
7
4
4
March
5.8
6
6
6
April
9.3
8
11
May
15.6
14
18
June
21.6
21
23
July
19.1
18
20
August
19.8
16
24
September
11.8
11
12
October
11.0
11
11
November
5.4
5
6
December
1.0
3
-3
Average
8.4
4.5
9.7
11.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
43.5
48
54
28
February
40.5
29
32
60
March
41.1
29
61
22
April
49.3
37
62
May
19.5
18
21
June
13.2
15
10
July
25.8
36
16
August
14.5
20
2
September
16.9
4
29
October
23.0
37
13
November
45.9
63
24
December
32.0
48
10
Average
32.0
34.1
35.7
26.2
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
January
7.5
7
9
6
February
7.7
6
5
12
March
6.7
7
7
4
April
7.3
7
8
May
5.6
5
6
June
7.3
8
7
July
6.2
8
5
August
5.6
6
5
September
4.1
4
5
October
5.2
6
5
November
5.3
7
3
December
4.9
6
3
Average
6.3
6.8
6.4
5.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
206°
213°
268°
February
199°
225°
238°
March
218°
255°
057°
April
301°
237°
May
355°
255°
June
332°
240°
July
229°
307°
August
231°
017°
September
224°
260°
October
184°
200°
November
207°
165°
December
223°
180°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.