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
53.5
50
February
85.7
100
75
March
74.0
80
71
April
52.3
42
May
66.6
71
June
74.1
81
July
65.2
57
81
August
65.6
73
58
September
68.5
81
58
October
85.7
75
92
November
74.4
76
71
December
40.0
29
48
Average
71.5
88.8
64.1
65.3
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
0.0
1
February
3.2
8
2
March
7.3
6
9
April
13.9
15
May
18.5
20
June
22.2
22
July
25.8
25
26
August
27.4
28
26
September
22.8
23
22
October
14.6
16
14
November
10.7
11
10
December
3.3
6
1
Average
13.5
6.4
15.7
17.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-3.5
-3
February
0.8
6
-1
March
5.1
3
7
April
11.8
12
May
17.6
18
June
20.4
20
July
24.7
24
25
August
26.2
27
25
September
20.0
22
19
October
12.6
15
12
November
9.0
10
7
December
1.8
4
-1
Average
11.5
3.6
13.8
15.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
39.2
25
February
7.1
25
0
March
7.4
20
6
April
42.8
55
May
37.0
38
June
22.5
29
July
55.5
68
33
August
56.7
55
61
September
40.0
44
37
October
42.8
50
39
November
48.9
59
35
December
74.2
64
81
Average
37.2
22.2
46.2
50.0
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
January
6.0
6
February
5.0
3
4
March
7.1
7
7
April
9.2
9
May
8.6
9
June
7.6
8
July
7.5
8
7
August
7.5
7
8
September
7.9
7
8
October
6.2
4
7
November
6.6
7
6
December
9.4
10
9
Average
7.0
5.1
7.5
7.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
282°
February
186°
257°
March
214°
246°
April
233°
May
227°
June
208°
July
195°
215°
August
209°
214°
September
197°
328°
October
201°
272°
November
263°
298°
December
239°
300°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.