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
2024
2023
2022
2021
2020
January
56.5
68
57
39
43
75
February
42.6
49
27
27
39
47
March
39.3
43
0
75
39
41
April
58.1
59
54
67
38
May
44.4
32
48
48
46
June
53.1
32
49
65
July
50.4
42
54
39
30
August
59.8
53
47
63
53
September
80.5
83
65
79
83
October
85.7
77
85
85
78
November
75.4
73
68
72
57
December
56.6
53
25
71
Average
58.9
47.2
57.4
49.7
55.2
53.2
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
2024
2023
2022
2021
2020
January
-14.7
-5
-15
-19
-15
-15
February
-16.8
-10
-19
-20
-18
-21
March
-9.2
-13
-3
-1
-10
-8
April
-5.5
-10
0
-5
-4
May
1.3
-1
2
1
3
June
7.6
7
7
8
July
10.9
13
11
10
10
August
10.0
9
9
10
11
September
7.9
7
9
7
7
October
2.8
2
2
0
4
November
-2.0
-2
-1
-6
-1
December
-9.9
-11
-10
-8
Average
-2.8
-11.7
-3.7
1.1
-2.4
-1.2
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
-19.3
-11
-21
-24
-19
-20
February
-21.9
-17
-23
-24
-24
-26
March
-15.4
-20
-3
-7
-17
-13
April
-11.9
-17
-7
-12
-9
May
-3.3
-6
-2
-4
-2
June
3.4
2
3
3
July
7.6
9
7
7
6
August
7.1
7
6
6
7
September
4.7
4
5
3
5
October
-1.5
-1
-2
-2
2
November
-6.0
-6
-4
-11
-3
December
-13.0
-15
-13
-14
Average
-6.4
-17.0
-7.5
-3.1
-7.7
-5.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
42.5
37
47
51
61
25
February
55.8
69
65
53
53
53
March
58.7
62
0
25
53
52
April
38.3
38
26
33
56
May
20.8
43
11
12
10
June
14.7
25
23
6
July
20.3
32
21
28
16
August
18.6
31
22
25
8
September
21.7
28
25
27
25
October
22.9
35
16
32
32
November
37.1
42
47
53
63
December
57.3
70
83
41
Average
31.4
62.5
39.2
24.8
31.5
25.0
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
2024
2023
2022
2021
2020
January
16.5
20
14
17
18
17
February
18.2
15
18
19
18
18
March
18.5
16
7
5
17
20
April
14.3
11
13
13
15
May
13.9
15
19
13
13
June
13.9
18
14
13
July
14.6
13
13
18
14
August
14.4
15
16
15
13
September
12.3
12
13
11
14
October
13.6
14
13
14
14
November
16.9
16
21
13
17
December
18.2
17
23
17
Average
14.9
16.2
13.8
15.9
14.7
14.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
117°
061°
043°
030°
038°
February
071°
058°
062°
049°
051°
March
052°
279°
041°
119°
160°
April
045°
058°
050°
078°
May
061°
182°
050°
058°
June
168°
160°
070°
July
178°
086°
182°
172°
August
074°
180°
165°
113°
September
337°
094°
018°
013°
October
113°
264°
030°
047°
November
100°
164°
052°
024°
December
032°
125°
064°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.