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
2020
January
72.7
77
62
80
64
83
February
78.2
61
76
85
89
85
March
83.9
77
79
93
92
87
April
92.4
84
92
91
95
98
May
94.7
94
99
94
86
96
June
97.0
97
97
98
97
97
July
95.9
92
97
96
96
96
August
93.4
97
80
94
92
96
September
89.9
88
89
98
93
83
October
83.0
79
88
87
84
77
November
69.5
52
79
84
75
December
66.4
59
76
74
63
Average
88.3
87.1
85.0
91.6
89.2
89.2
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
2020
January
1.7
0
3
3
0
6
February
2.3
2
3
3
0
5
March
5.7
6
4
8
7
7
April
10.1
8
10
10
10
12
May
16.2
19
16
15
14
14
June
21.3
20
22
21
23
22
July
22.3
22
21
22
25
21
August
21.5
22
20
24
20
23
September
16.9
18
19
15
16
18
October
11.1
12
10
13
12
12
November
5.6
3
6
6
9
December
1.8
0
-2
0
5
Average
11.6
12.9
10.7
11.9
10.9
12.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-4.4
-7
-2
-3
-5
1
February
-4.3
-2
-3
-3
-7
-1
March
-3.6
-1
-4
-4
-1
-1
April
-1.8
1
-1
-1
-1
0
May
4.7
7
4
5
5
3
June
10.3
10
9
11
12
10
July
11.8
12
11
12
14
10
August
11.5
11
12
13
10
12
September
8.2
8
11
6
7
9
October
4.3
5
2
6
5
5
November
1.0
-1
3
0
4
December
-3.6
-5
-7
-5
2
Average
3.5
4.3
2.8
3.4
2.7
4.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.7
22
14
10
28
6
February
14.2
19
12
15
7
11
March
12.7
8
23
0
10
12
April
7.6
15
6
10
9
3
May
6.7
4
5
10
17
5
June
4.9
8
3
6
4
3
July
5.4
5
8
5
6
9
August
7.2
3
14
3
12
3
September
6.6
5
4
6
5
9
October
11.5
11
17
8
12
13
November
16.6
25
20
12
20
December
18.8
39
12
7
25
Average
9.1
8.5
11.9
7.7
9.9
8.3
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
2020
January
8.9
10
10
10
8
11
February
9.1
8
9
10
8
11
March
9.5
9
10
8
11
10
April
9.4
9
8
8
10
11
May
8.2
8
8
9
8
8
June
8.2
8
8
8
7
8
July
8.1
8
9
8
8
9
August
8.0
9
8
8
8
7
September
8.5
7
8
7
9
9
October
9.1
8
10
9
9
9
November
7.8
8
7
8
10
December
7.5
7
6
7
8
Average
8.5
8.4
8.5
8.2
8.3
9.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
269°
219°
274°
330°
251°
February
209°
278°
248°
314°
248°
March
120°
263°
260°
288°
256°
April
290°
072°
305°
304°
297°
May
113°
177°
249°
137°
275°
June
204°
145°
217°
229°
125°
July
226°
220°
256°
129°
237°
August
222°
174°
203°
280°
217°
September
169°
215°
003°
265°
259°
October
213°
292°
234°
218°
225°
November
336°
106°
254°
244°
December
291°
306°
273°
150°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.