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
44.3
41
46
45
February
72.6
81
48
97
March
73.4
72
82
66
April
72.5
74
71
May
85.1
88
84
June
80.5
86
78
July
85.7
91
77
August
74.4
80
67
September
60.4
60
61
October
52.9
64
42
November
58.0
82
38
December
27.7
38
18
Average
64.3
63.3
69.8
59.9
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
2.0
1
3
2
February
5.3
7
3
6
March
8.7
9
9
9
April
10.5
10
11
May
17.8
16
19
June
23.0
24
22
July
23.1
22
24
August
22.3
22
23
September
17.0
20
14
October
12.8
13
13
November
6.5
7
6
December
1.2
2
0
Average
10.0
5.8
11.9
12.3
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
-2
2
0
February
3.4
6
1
4
March
6.3
6
6
7
April
7.3
7
8
May
14.6
14
15
June
19.6
21
18
July
19.9
19
21
August
19.4
18
21
September
11.8
14
10
October
8.9
9
9
November
4.0
5
4
December
-1.3
1
-2
Average
7.2
3.3
8.9
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
34.5
44
46
25
February
24.2
24
15
35
March
23.8
17
37
17
April
43.7
55
33
May
18.5
20
18
June
5.1
7
4
July
21.9
21
24
August
32.0
39
22
September
15.6
4
24
October
24.5
32
17
November
35.0
53
20
December
43.3
27
60
Average
27.3
27.7
30.1
24.2
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
7.0
8
5
8
February
7.2
7
4
12
March
6.4
6
8
5
April
5.9
6
6
May
4.3
5
4
June
5.9
5
6
July
6.8
7
6
August
5.6
6
4
September
3.8
3
5
October
2.9
4
2
November
6.1
9
4
December
3.8
4
4
Average
5.9
6.8
5.5
5.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
261°
305°
268°
February
242°
351°
266°
March
248°
253°
049°
April
294°
290°
May
007°
303°
June
340°
288°
July
258°
281°
August
277°
273°
September
271°
265°
October
274°
225°
November
264°
105°
December
251°
034°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.