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
50.5
51
0
66
40
66
February
45.4
46
32
65
40
March
46.3
41
0
51
46
54
April
57.4
0
53
68
0
May
62.9
0
68
86
93
June
52.0
0
31
83
77
July
51.9
0
52
25
August
47.7
0
0
24
56
September
52.4
0
0
100
64
October
52.7
33
0
80
40
November
63.7
0
95
69
December
58.5
65
0
50
62
Average
52.6
45.1
6.2
30.2
67.7
60.7
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
-9.3
-10
-11
-10
-1
-13
February
-5.1
-4
-6
-6
-7
March
-4.8
-9
-2
0
-3
-7
April
0.7
-4
2
1
-1
May
7.9
4
8
9
11
June
12.3
10
16
13
13
July
13.0
15
12
12
August
11.6
13
12
8
12
September
10.4
10
10
7
9
October
4.9
4
4
3
4
November
-2.4
-1
-8
0
December
-6.3
-9
-2
-4
-6
Average
2.2
-8.9
2.8
3.5
2.3
1.0
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
-14.2
-14
-15
-17
-3
-19
February
-11.4
-10
-12
-12
-14
March
-9.4
-14
-4
-4
-12
-12
April
-5.6
-9
-2
-5
-1
May
1.9
0
1
2
6
June
6.6
6
8
8
8
July
8.4
9
8
10
August
7.5
8
9
5
7
September
5.8
5
6
1
4
October
1.2
-1
0
-1
1
November
-6.4
-6
-13
-3
December
-11.7
-15
-7
-9
-11
Average
-3.3
-13.6
-2.1
-2.2
-4.8
-4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
22.5
34
0
32
40
22
February
44.2
50
55
39
40
March
28.8
37
0
14
56
31
April
16.2
0
16
24
100
May
12.8
0
9
10
13
June
5.7
0
0
17
3
July
10.4
0
20
50
August
10.0
0
0
10
6
September
11.7
0
0
8
15
October
14.5
9
0
27
9
November
18.3
0
31
28
December
27.9
42
0
34
37
Average
19.0
42.5
2.7
10.8
24.9
19.1
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
10.5
7
7
15
13
12
February
14.9
14
16
15
14
March
11.4
18
0
11
15
9
April
9.3
0
7
13
16
May
9.0
0
11
11
11
June
8.4
0
11
10
11
July
9.9
10
11
15
August
7.8
0
12
6
8
September
10.2
0
14
12
12
October
8.8
0
11
13
6
November
12.7
14
12
13
December
11.4
0
10
15
15
Average
10.3
14.6
0.2
11.7
12.0
11.1
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
333°
346°
350°
270°
347°
February
016°
039°
036°
021°
March
341°
360°
028°
220°
335°
April
360°
031°
357°
151°
May
360°
288°
031°
118°
June
360°
144°
189°
300°
July
169°
180°
134°
August
360°
235°
133°
277°
September
360°
195°
353°
342°
October
360°
026°
326°
052°
November
320°
352°
106°
December
360°
113°
191°
017°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.