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
2021
January
56.1
67
50
71
54
February
71.7
66
66
82
77
March
86.9
94
89
98
76
April
92.4
84
89
93
95
May
95.4
98
97
93
90
June
95.9
97
95
95
98
July
95.1
95
99
93
100
August
93.7
96
95
98
89
September
92.1
95
97
85
91
October
81.6
83
80
81
84
November
58.7
59
76
54
62
December
51.5
50
58
38
53
Average
85.0
85.7
86.3
86.4
84.5
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
2021
January
0.1
-2.3
2.2
1.9
-2.1
February
1.8
5.0
2.0
4.0
-2.1
March
6.3
8.4
6.7
6.7
5.2
April
12.5
13.0
13.1
10.3
10.8
May
18.3
21.6
18.6
16.1
15.9
June
23.6
23.3
23.0
22.8
25.1
July
23.7
25.1
23.3
22.3
28.3
August
23.9
24.8
25.5
26.5
20.6
September
19.0
22.8
23.0
15.1
15.6
October
12.2
12.0
11.5
13.4
12.1
November
5.4
5.4
4.0
4.2
5.9
December
1.6
3.3
1.9
-3.0
-1.0
Average
12.5
13.6
12.9
12.2
11.3
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
-4.0
-7.2
-1.0
-3.2
-6.7
February
-4.6
0.4
-3.0
-2.9
-10.4
March
-2.2
0.7
-2.8
-5.7
-3.6
April
2.3
4.5
3.2
1.1
1.6
May
6.3
8.1
4.5
5.0
6.2
June
11.8
11.4
10.6
12.0
12.8
July
13.5
14.6
12.0
13.3
16.5
August
12.9
13.9
15.0
14.0
11.9
September
8.8
11.3
10.8
6.0
6.7
October
5.2
5.2
4.7
6.5
4.2
November
1.5
1.5
-1.7
0.9
1.5
December
-2.1
0.3
-2.6
-7.5
-6.0
Average
4.3
5.4
4.5
4.0
3.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
28.6
36
32
26
42
February
22.5
25
27
29
15
March
11.0
4
15
2
18
April
10.9
16
13
14
15
May
7.9
6
3
10
17
June
5.4
4
5
7
3
July
6.8
6
5
10
2
August
6.1
2
5
2
15
September
6.7
2
2
10
9
October
12.3
6
14
5
6
November
16.4
18
20
24
18
December
25.2
13
32
28
29
Average
11.4
9.6
11.7
11.6
13.7
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
2021
January
7.3
7
7
8
6
February
7.7
7
7
10
6
March
7.4
7
8
6
7
April
7.8
8
7
8
8
May
6.4
5
5
7
7
June
5.7
5
5
5
5
July
6.0
6
6
6
6
August
5.3
5
6
5
6
September
6.3
5
6
6
7
October
7.3
6
9
6
8
November
6.9
8
7
5
8
December
7.1
8
7
6
6
Average
6.6
6.2
6.4
6.3
6.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
207°
197°
258°
152°
February
203°
266°
235°
259°
March
154°
236°
306°
244°
April
251°
049°
322°
268°
May
114°
033°
260°
220°
June
247°
339°
236°
316°
July
255°
258°
266°
160°
August
256°
207°
109°
243°
September
130°
195°
262°
275°
October
217°
243°
236°
185°
November
235°
209°
164°
222°
December
228°
233°
165°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.