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
77.0
83
52
85
77
85
February
67.7
56
58
54
70
79
March
74.2
76
65
79
59
75
April
85.5
86
94
81
78
May
87.9
80
77
97
93
June
86.8
85
93
81
88
July
77.3
72
83
69
74
August
79.3
82
75
89
86
September
84.6
86
84
85
94
October
81.5
88
73
82
80
November
75.6
75
69
91
81
December
74.6
69
82
47
83
Average
79.4
71.4
76.2
79.8
78.9
83.3
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
-10.2
-8
-10
-12
-9
-17
February
-7.9
-5
-8
-8
-8
-9
March
-4.1
-6
-3
-3
-5
-6
April
3.4
-3
5
1
5
May
12.4
9
13
14
15
June
17.7
16
21
16
17
July
17.8
16
17
16
18
August
16.0
16
15
15
18
September
11.7
10
11
11
12
October
5.4
4
5
3
6
November
-4.8
-1
-3
-14
-1
December
-7.1
-10
-5
-5
-7
Average
3.3
-7.7
3.0
5.0
3.0
4.1
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
-16.0
-14
-15
-18
-15
-24
February
-14.9
-11
-15
-13
-15
-19
March
-12.5
-14
-10
-9
-15
-13
April
-5.1
-12
-4
-6
-3
May
2.2
1
2
2
4
June
8.1
7
9
8
8
July
10.2
10
10
10
10
August
8.8
9
8
8
9
September
5.0
4
6
4
4
October
-1.2
-3
-2
-3
0
November
-9.0
-6
-9
-20
-7
December
-14.8
-19
-11
-10
-14
Average
-4.0
-13.0
-4.1
-3.6
-5.7
-4.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.9
17
30
27
16
9
February
26.5
36
29
35
22
26
March
19.3
28
36
12
27
14
April
13.7
15
5
22
20
May
14.3
29
9
5
8
June
12.4
20
6
17
13
July
19.8
33
27
31
8
August
21.0
24
25
12
13
September
18.9
25
30
14
11
October
15.4
7
20
17
13
November
19.7
19
31
8
19
December
19.5
24
9
46
17
Average
18.6
28.1
24.6
19.1
18.8
13.6
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
11.7
14
11
14
10
10
February
12.6
13
13
13
12
12
March
12.1
12
15
14
13
11
April
9.8
10
9
11
10
May
8.9
11
9
8
8
June
7.7
9
7
8
8
July
8.2
9
9
9
7
August
9.0
9
11
9
7
September
9.5
9
10
9
10
October
9.4
8
9
11
9
November
10.7
10
12
8
12
December
11.8
11
11
16
12
Average
10.1
13.0
10.1
10.2
9.9
9.1
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
050°
015°
014°
010°
350°
February
114°
200°
045°
032°
043°
March
017°
193°
016°
212°
250°
April
350°
066°
355°
140°
May
155°
304°
052°
107°
June
150°
271°
177°
200°
July
174°
206°
193°
242°
August
184°
226°
222°
328°
September
250°
179°
268°
007°
October
004°
183°
356°
094°
November
133°
342°
350°
152°
December
324°
061°
226°
033°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.