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
72.7
81
60
73
77
75
February
77.5
81
74
63
85
85
March
74.3
62
73
58
81
81
April
78.4
78
74
87
88
May
88.4
95
79
96
88
June
85.4
77
76
90
93
July
89.5
81
96
91
84
August
85.2
66
90
90
91
September
84.4
77
81
84
94
October
79.3
70
89
80
82
November
80.1
80
75
88
78
December
75.3
71
68
71
76
Average
81.0
72.9
75.3
77.5
86.1
85.6
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
-7.9
-5
-4
-10
-5
-5
February
-5.5
-2
-6
-5
-5
-4
March
0.6
3
1
-1
2
1
April
7.6
9
7
11
6
May
16.6
17
18
17
16
June
21.3
20
21
23
23
July
24.9
26
25
23
25
August
23.2
21
24
26
24
September
18.7
21
19
19
18
October
12.0
14
15
14
9
November
2.4
2
5
4
5
December
-4.9
0
0
-3
-1
Average
8.2
-2.6
10.0
10.1
10.3
9.7
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
-14.5
-13
-10
-19
-10
-12
February
-14.7
-11
-16
-15
-13
-13
March
-8.5
-5
-6
-8
-8
-8
April
-1.3
0
0
0
-2
May
5.4
5
6
5
5
June
11.0
12
11
12
12
July
14.5
17
14
12
15
August
13.4
13
14
15
13
September
9.0
11
9
10
8
October
4.0
7
5
6
1
November
-5.9
-5
-2
-2
-3
December
-10.3
-6
-6
-11
-8
Average
-1.5
-10.8
1.9
1.0
1.5
0.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
27.6
24
40
33
24
25
February
20.7
12
28
29
20
16
March
25.8
32
28
38
22
18
April
20.9
15
28
20
15
May
13.3
14
12
15
14
June
11.5
20
19
9
3
July
7.5
10
9
7
7
August
9.8
23
8
7
10
September
10.9
14
10
12
5
October
13.6
18
8
8
19
November
20.4
19
24
14
14
December
25.1
31
37
27
21
Average
17.0
23.6
20.7
20.1
14.1
12.9
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
9.0
9
8
9
9
8
February
9.6
10
9
9
9
9
March
10.4
10
9
10
12
11
April
9.8
9
11
10
11
May
9.4
10
8
9
10
June
8.0
7
8
8
8
July
7.1
6
8
7
7
August
7.0
7
6
7
8
September
7.7
6
7
8
9
October
8.2
8
8
7
9
November
9.1
8
9
9
9
December
9.3
8
11
10
10
Average
8.8
9.7
8.0
8.5
8.6
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
291°
331°
321°
323°
324°
February
286°
293°
308°
309°
275°
March
311°
323°
313°
282°
312°
April
244°
334°
343°
302°
May
322°
255°
312°
307°
June
051°
225°
258°
261°
July
178°
268°
291°
219°
August
220°
258°
231°
278°
September
327°
295°
256°
247°
October
198°
200°
327°
262°
November
274°
278°
288°
264°
December
303°
337°
296°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.