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
50.0
50
February
50.0
0
50
March
53.3
17
78
April
31.8
40
25
May
50.0
50
June
50.0
50
July
46.1
56
25
August
42.8
46
40
September
83.3
78
100
October
70.0
33
86
November
46.6
22
83
December
88.8
100
88
Average
49.6
31.2
49.3
68.4
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
-2.7
-1
February
1.5
1
2
March
6.9
7
7
April
11.6
12
11
May
16.5
17
June
20.0
20
July
24.0
24
24
August
25.0
26
25
September
22.1
22
22
October
16.6
17
16
November
9.3
10
8
December
1.1
3
0
Average
12.5
9.3
14.0
14.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-2.7
-1
February
1.5
1
2
March
5.4
6
5
April
10.1
11
10
May
15.8
16
June
19.4
19
July
23.5
23
24
August
24.5
25
24
September
21.9
22
22
October
15.3
16
14
November
8.5
9
8
December
0.5
3
-1
Average
11.6
7.9
13.3
13.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
50.0
50
February
0.0
0
0
March
20.0
17
22
April
36.3
30
42
May
50.0
50
June
50.0
50
July
53.8
44
75
August
38.0
36
40
September
66.6
56
100
October
30.0
67
14
November
66.6
78
50
December
77.7
100
75
Average
41.5
25.0
46.9
52.6
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
5.2
5
February
3.0
0
3
March
5.1
3
6
April
7.0
8
6
May
5.5
6
June
4.0
4
July
5.6
5
8
August
5.3
4
7
September
5.4
4
10
October
8.5
4
10
November
9.0
12
5
December
6.0
6
6
Average
6.4
6.0
5.6
7.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
135°
February
360°
068°
March
225°
212°
April
250°
227°
May
183°
June
214°
July
180°
063°
August
180°
202°
September
139°
180°
October
243°
272°
November
258°
270°
December
090°
025°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.