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
71.9
71
67
68
67
68
February
77.1
70
81
80
74
77
March
79.0
66
80
90
69
77
April
78.3
60
82
81
69
May
73.0
74
76
64
69
June
81.8
89
87
71
90
July
75.8
67
71
80
84
August
73.9
82
68
75
93
September
82.9
95
76
83
77
October
84.6
84
85
71
87
November
82.3
71
75
89
78
December
76.0
77
73
69
67
Average
77.2
68.7
77.2
77.9
74.1
78.5
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
-18.3
-15
-17
-22
-14
-16
February
-21.3
-17
-24
-24
-18
-20
March
-15.9
-11
-15
-15
-15
-15
April
-7.0
-6
-7
-4
-8
May
0.8
2
3
1
0
June
7.6
11
12
5
7
July
11.7
14
9
11
15
August
12.1
14
13
11
14
September
8.8
12
10
10
9
October
4.3
6
5
8
2
November
-3.3
-2
-3
0
-3
December
-10.9
-5
-9
-8
-9
Average
-4.3
-15.8
-1.0
-2.1
-2.7
-3.8
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
-22.7
-19
-21
-26
-17
-21
February
-25.2
-21
-29
-28
-22
-24
March
-19.1
-16
-20
-20
-19
-20
April
-11.0
-9
-11
-8
-12
May
-3.7
-1
-1
-1
-4
June
3.2
5
7
1
3
July
6.9
8
6
6
10
August
8.5
10
9
8
11
September
6.1
8
6
7
6
October
2.1
3
3
5
0
November
-5.5
-3
-5
-2
-5
December
-12.5
-7
-10
-11
-13
Average
-8.8
-19.7
-5.3
-6.4
-5.3
-6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
66.4
65
55
89
59
71
February
61.6
42
69
84
56
67
March
47.9
59
44
47
56
45
April
33.7
29
32
17
42
May
24.7
12
22
24
36
June
8.8
4
15
10
6
July
8.5
9
7
5
3
August
7.7
7
11
7
3
September
12.2
6
9
9
27
October
18.0
11
20
12
31
November
56.1
61
69
37
64
December
70.2
64
58
86
72
Average
34.7
55.0
27.6
34.7
29.0
35.8
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
13.5
16
12
18
11
13
February
13.6
12
13
15
14
13
March
13.7
14
13
13
17
14
April
13.8
13
14
13
16
May
13.7
15
15
15
15
June
12.7
12
12
14
12
July
13.2
13
12
15
13
August
13.5
13
15
15
11
September
14.7
13
15
15
18
October
14.8
13
16
13
16
November
16.0
18
18
15
17
December
15.2
15
15
17
15
Average
14.0
14.0
13.5
14.7
14.3
14.3
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
272°
230°
245°
203°
232°
February
293°
219°
229°
208°
260°
March
269°
319°
247°
295°
236°
April
344°
004°
024°
333°
May
293°
234°
326°
284°
June
351°
077°
278°
017°
July
235°
312°
247°
155°
August
281°
224°
261°
338°
September
212°
255°
275°
265°
October
284°
207°
118°
242°
November
237°
332°
333°
289°
December
224°
225°
240°
239°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.