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
41.8
56
38
32
February
60.4
63
50
69
March
55.6
69
56
42
April
83.0
95
77
May
71.4
67
79
June
91.8
96
86
July
58.1
53
73
August
72.4
67
85
September
65.7
81
57
October
50.9
46
61
November
50.0
51
47
December
27.5
27
29
Average
60.1
62.7
56.1
61.4
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
3.5
3
4
4
February
6.3
7
5
7
March
7.0
9
6
6
April
10.9
9
13
May
16.1
15
18
June
22.0
23
21
July
20.1
19
21
August
21.3
18
25
September
16.1
20
13
October
12.0
12
13
November
7.0
7
8
December
2.6
4
0
Average
9.9
5.7
11.7
12.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
2.1
1
3
2
February
4.0
6
2
4
March
4.4
6
4
4
April
8.7
7
11
May
14.8
13
17
June
20.5
21
20
July
17.4
17
19
August
19.3
16
23
September
14.3
18
11
October
10.1
10
11
November
5.9
5
7
December
1.0
2
-1
Average
8.1
4.1
9.7
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
51.1
64
46
44
February
48.6
42
44
59
March
35.2
25
56
8
April
33.9
21
41
May
20.4
27
11
June
6.1
4
9
July
40.9
50
17
August
34.4
47
7
September
24.2
19
27
October
25.4
36
6
November
37.0
51
11
December
44.8
49
35
Average
37.6
44.0
42.2
26.6
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
10.6
11
11
10
February
11.2
11
10
13
March
8.6
9
10
6
April
12.0
13
12
May
6.8
7
7
June
8.5
8
9
July
8.2
8
8
August
8.0
8
8
September
5.5
6
6
October
6.3
7
6
November
8.6
9
9
December
7.9
9
5
Average
9.2
10.3
8.7
8.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
252°
248°
279°
February
250°
261°
262°
March
226°
275°
090°
April
316°
255°
May
310°
254°
June
350°
266°
July
241°
294°
August
241°
243°
September
194°
256°
October
264°
237°
November
238°
197°
December
254°
072°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.