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
60.6
39
68
61
72
February
53.0
32
42
60
53
March
56.7
38
48
49
33
55
April
73.7
58
91
58
May
80.9
71
75
96
90
June
77.3
80
90
75
51
July
57.6
51
100
73
63
0
August
65.6
55
57
71
66
September
78.2
69
86
88
October
77.0
67
82
81
November
71.7
59
87
75
December
64.0
57
57
57
Average
65.7
61.0
39.8
67.7
72.2
60.5
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
-10.0
-9
-13
-9
-15
February
-8.2
-9
-9
-10
-12
March
-4.0
-4
-4
-4
-7
-5
April
1.3
0
2
1
May
8.8
4
9
14
12
June
14.6
14
16
13
15
July
14.7
14
12
14
13
14
August
13.6
11
12
13
16
September
10.7
10
10
10
October
4.8
3
3
6
November
-3.7
-3
-8
0
December
-6.2
-4
-5
-7
Average
2.6
7.3
-8.9
2.6
2.6
2.8
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
-16.4
-15
-18
-15
-20
February
-14.5
-13
-14
-17
-20
March
-11.4
-11
-10
-10
-14
-11
April
-5.1
-7
-5
-4
May
1.3
-1
0
4
3
June
7.2
6
7
7
7
July
9.1
8
12
9
9
8
August
8.6
8
8
8
9
September
5.9
6
5
5
October
0.1
-1
-2
1
November
-7.1
-7
-14
-4
December
-12.9
-8
-10
-13
Average
-4.9
1.3
-13.7
-3.0
-3.0
-4.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
37.5
52
34
52
20
February
45.4
66
56
44
50
March
36.6
66
46
42
59
26
April
22.2
35
17
21
May
13.5
26
5
3
13
June
10.3
21
5
18
6
July
13.9
21
0
18
20
7
August
16.4
25
12
22
8
September
16.6
26
17
17
October
20.4
27
23
15
November
27.4
37
40
17
December
34.4
30
29
40
Average
25.2
28.2
54.3
23.6
25.1
17.1
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
14.5
16
17
15
13
February
17.1
15
19
16
17
March
15.1
17
17
19
21
14
April
12.5
14
12
12
May
10.7
12
11
11
9
June
10.3
11
10
10
10
July
10.0
10
12
10
10
9
August
11.3
14
13
12
8
September
11.3
10
10
12
October
11.8
11
12
11
November
13.5
15
9
13
December
15.4
17
17
15
Average
12.5
12.6
15.7
13.3
11.8
11.3
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
023°
027°
036°
033°
February
056°
059°
054°
045°
March
050°
162°
018°
121°
191°
April
117°
088°
088°
May
037°
314°
063°
083°
June
076°
343°
180°
300°
July
239°
136°
258°
213°
252°
August
199°
287°
225°
007°
September
121°
340°
357°
October
040°
016°
080°
November
023°
017°
120°
December
135°
200°
059°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.