Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
2025
2024
2023
2022
2021
January
76.2
87
70
63
80
65
February
83.3
81
76
69
83
78
March
84.3
82
69
83
87
91
April
88.2
83
91
79
83
May
85.7
88
68
92
83
85
June
84.9
82
83
88
83
84
July
84.2
86
82
79
68
August
88.5
89
65
94
94
September
90.3
92
88
89
100
October
80.8
84
59
82
90
November
70.7
43
77
68
82
December
68.0
60
50
58
82
Average
83.9
83.6
75.5
76.9
81.5
83.8
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi 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
2025
2024
2023
2022
2021
January
-15.6
-16.1
-13.9
-11.8
-19.0
-11.5
February
-14.3
-14.0
-9.0
-17.3
-16.0
-15.6
March
-6.9
-7.2
-6.0
-7.2
-6.7
-3.6
April
3.3
6.2
2.9
3.0
4.9
May
12.8
15.5
12.8
16.6
12.3
12.0
June
19.6
19.6
19.1
23.5
18.8
19.1
July
23.2
23.8
20.8
22.5
23.3
August
20.9
23.1
21.3
21.5
19.8
September
15.7
20.5
18.5
16.8
16.6
October
6.3
7.9
7.0
8.0
10.8
November
-5.5
1.1
-4.6
-4.2
-2.0
December
-12.3
-10.9
-5.9
-14.9
-16.4
Average
4.1
-1.2
6.5
7.1
4.5
5.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
-23.0
-25.6
-21.0
-21.6
-30.1
-18.5
February
-25.0
-25.6
-21.3
-28.3
-30.3
-27.5
March
-19.8
-20.0
-19.1
-22.6
-20.6
-15.0
April
-9.3
-7.0
-9.3
-9.8
-6.0
May
0.7
1.5
1.8
2.9
1.8
-1.9
June
8.0
7.2
7.5
10.9
6.9
8.0
July
11.8
12.5
10.5
10.9
11.1
August
10.8
11.3
10.5
10.9
10.3
September
7.0
10.4
9.6
6.5
8.6
October
0.3
0.7
0.5
0.6
4.2
November
-11.7
-4.9
-10.5
-10.0
-7.0
December
-20.5
-16.3
-12.1
-21.8
-24.5
Average
-6.0
-13.5
-4.5
-4.8
-6.0
-5.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
46.1
53
57
58
41
43
February
32.4
40
51
34
25
32
March
30.9
34
53
30
29
24
April
18.0
25
24
29
20
May
17.6
14
32
13
25
21
June
15.2
12
28
7
27
15
July
11.2
10
24
19
7
August
9.3
6
13
14
10
September
12.7
14
6
21
6
October
25.3
20
31
24
18
November
54.4
57
53
54
44
December
50.1
66
56
55
40
Average
23.9
29.1
33.7
27.0
28.3
21.0
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
2025
2024
2023
2022
2021
January
6.5
9
7
2
8
6
February
6.3
7
7
9
0
7
March
6.6
7
8
6
0
8
April
6.5
6
7
2
8
May
7.0
7
7
6
8
7
June
6.5
6
7
6
7
7
July
6.6
6
7
6
6
August
7.0
8
6
7
7
September
7.5
8
6
8
8
October
7.9
9
6
9
7
November
7.0
8
10
0
9
December
6.4
7
8
0
7
Average
6.9
7.0
7.2
6.1
4.9
7.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
303°
295°
288°
280°
261°
February
300°
325°
278°
360°
271°
March
307°
323°
303°
130°
296°
April
026°
029°
060°
319°
May
099°
359°
071°
249°
296°
June
274°
278°
164°
293°
257°
July
265°
281°
302°
263°
August
284°
286°
276°
250°
September
234°
234°
278°
248°
October
299°
346°
278°
268°
November
307°
296°
360°
289°
December
290°
263°
360°
272°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.