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
68.7
65
78
64
66
66
February
74.3
65
63
69
86
80
March
82.1
73
78
71
87
86
April
81.3
66
79
90
83
May
88.2
88
86
88
90
June
87.3
78
93
86
84
July
92.4
88
87
93
94
August
87.4
84
85
89
86
September
83.2
70
78
87
91
October
75.1
58
80
79
86
November
64.9
70
62
74
57
December
70.3
61
64
76
67
Average
79.9
68.1
74.1
78.2
84.6
82.3
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
-9.6
-7
-6
-13
-7
-6
February
-7.5
-2
-6
-9
-7
-6
March
-1.8
2
-1
-2
4
1
April
7.4
8
7
12
6
May
17.1
20
20
17
15
June
22.6
24
23
24
23
July
25.1
24
24
24
26
August
22.8
22
23
25
22
September
18.0
20
18
17
16
October
10.1
11
12
15
6
November
0.2
1
3
1
4
December
-6.2
-2
-5
-6
-5
Average
7.2
-3.8
9.6
8.9
9.8
8.5
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
-18.0
-14
-16
-27
-13
-16
February
-19.3
-14
-18
-24
-22
-16
March
-13.4
-9
-14
-12
-11
-11
April
-5.4
-3
-3
-2
-7
May
3.4
3
6
3
2
June
9.0
10
10
11
10
July
11.8
11
12
10
14
August
10.4
9
11
13
11
September
6.8
7
6
7
6
October
1.6
3
3
4
-2
November
-7.0
-7
-5
-5
-4
December
-15.8
-8
-13
-15
-13
Average
-4.1
-13.9
-2.1
-3.3
-2.5
-3.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
55.1
62
44
54
48
62
February
46.6
42
56
54
33
44
March
33.8
33
38
48
32
33
April
29.2
46
28
19
24
May
19.4
16
18
21
24
June
17.6
19
15
14
20
July
10.1
10
18
9
11
August
14.1
18
18
11
10
September
18.7
14
23
20
19
October
32.2
43
30
19
34
November
56.3
55
57
46
49
December
53.6
45
53
47
63
Average
31.1
44.2
31.7
31.8
24.3
29.6
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
7.2
7
7
8
6
7
February
7.5
7
8
8
6
8
March
8.4
8
8
8
9
8
April
8.2
9
8
8
8
May
7.1
7
7
7
7
June
6.6
6
8
6
7
July
6.0
5
7
6
6
August
6.1
6
6
7
6
September
6.4
6
6
7
7
October
7.0
7
8
6
7
November
7.4
8
8
7
7
December
7.0
7
7
7
7
Average
7.1
7.5
6.9
7.2
6.8
7.0
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
254°
249°
249°
281°
297°
February
276°
243°
266°
232°
271°
March
264°
343°
303°
268°
221°
April
339°
223°
010°
298°
May
338°
188°
283°
321°
June
010°
257°
252°
257°
July
261°
263°
315°
251°
August
302°
239°
213°
236°
September
299°
288°
244°
227°
October
310°
216°
240°
237°
November
243°
260°
239°
228°
December
265°
239°
232°
287°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.