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
59.8
40
58
58
55
59
February
64.0
45
74
68
57
56
March
62.7
59
60
58
56
66
April
71.3
67
59
79
81
May
76.5
81
69
69
80
June
79.9
58
90
89
62
July
77.7
66
66
88
81
August
82.0
77
83
78
74
September
81.5
73
75
69
90
October
78.6
86
69
77
77
November
72.0
69
53
65
84
December
61.1
58
58
53
57
Average
72.6
50.0
68.9
68.2
70.3
73.4
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
-20.9
-13.9
-18.6
-20.8
-23.8
-16.0
February
-23.0
-22.8
-17.6
-28.8
-26.3
-17.0
March
-16.8
-18.0
-13.5
-15.0
-15.1
-18.5
April
-8.6
-5.2
-6.4
-8.0
-6.4
May
1.3
3.9
3.2
1.7
1.3
June
10.8
10.6
12.9
15.9
5.7
July
15.6
14.0
17.3
18.3
13.4
August
14.3
15.0
15.6
13.1
12.8
September
9.6
11.6
10.3
10.1
10.5
October
2.5
5.2
3.1
3.0
6.2
November
-6.7
-1.0
-4.2
-7.4
-5.9
December
-12.8
-8.4
-8.0
-11.6
-11.0
Average
-4.2
-17.0
1.3
-2.8
-3.0
-2.2
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
-26.0
-19.8
-25.8
-26.5
-30.1
-24.1
February
-30.3
-28.5
-25.6
-35.7
-32.3
-25.6
March
-24.7
-25.0
-19.1
-24.3
-23.8
-27.3
April
-15.0
-12.1
-12.0
-17.5
-14.8
May
-5.7
-3.2
-3.7
-5.7
-3.1
June
2.6
3.1
3.2
4.5
0.0
July
7.8
7.2
9.0
10.9
5.9
August
8.2
9.9
8.9
8.0
6.9
September
4.4
6.2
4.0
5.0
4.7
October
-2.4
1.0
-2.9
-1.3
1.7
November
-11.3
-6.2
-9.6
-12.5
-9.8
December
-18.4
-15.4
-15.8
-16.0
-18.3
Average
-11.7
-24.5
-5.1
-8.0
-10.5
-9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
48.9
73
54
57
48
32
February
34.6
45
42
30
28
45
March
45.0
44
59
44
53
35
April
39.3
33
47
39
25
May
27.0
11
30
34
22
June
11.5
16
5
15
21
July
10.0
13
16
9
9
August
13.3
16
18
26
9
September
15.1
15
19
21
11
October
31.0
35
37
40
10
November
47.2
42
67
58
31
December
56.6
55
68
50
49
Average
30.0
51.4
29.2
32.9
35.4
22.5
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
12.3
15
15
12
12
9
February
12.0
12
10
12
14
14
March
12.9
14
13
11
13
13
April
13.0
14
11
13
13
May
13.7
13
15
15
13
June
13.0
14
12
15
14
July
12.7
14
12
14
13
August
13.7
12
12
16
17
September
13.5
13
14
15
13
October
13.6
12
14
17
14
November
13.2
14
15
14
14
December
14.1
14
15
15
13
Average
13.1
13.5
13.3
12.6
14.4
13.5
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
260°
262°
181°
195°
198°
February
236°
156°
189°
224°
202°
March
231°
081°
101°
205°
300°
April
060°
315°
328°
095°
May
064°
282°
137°
322°
June
268°
253°
079°
267°
July
251°
188°
111°
243°
August
221°
254°
221°
227°
September
226°
231°
238°
099°
October
195°
237°
235°
140°
November
095°
159°
324°
049°
December
131°
207°
137°
192°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.