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
60.8
69
0
64
33
79
February
53.6
38
100
41
66
45
March
59.9
50
58
57
49
60
April
70.4
70
72
63
61
May
63.1
40
55
73
86
June
65.6
66
81
64
81
July
45.3
29
43
36
60
August
50.1
42
31
73
55
September
60.2
5
57
78
75
October
68.7
6
81
79
79
November
70.1
71
54
92
70
December
58.7
56
77
46
60
Average
59.3
50.5
44.0
58.0
62.9
68.3
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
-5.2
-4
-8
-6
-4
-10
February
-2.8
-1
-12
0
-1
-3
March
-3.7
-4
-2
-2
-3
-2
April
1.9
-2
2
2
4
May
6.9
5
7
7
9
June
11.5
10
14
10
11
July
12.4
12
12
11
13
August
12.6
12
12
12
13
September
10.0
9
10
9
10
October
6.1
5
5
4
6
November
1.6
3
2
-8
2
December
-2.5
-4
2
-1
-2
Average
3.6
-4.7
4.4
4.8
3.2
4.2
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
-10.6
-9
-8
-12
-9
-14
February
-6.0
-6
-13
-5
-6
-10
March
-7.5
-9
-7
-5
-9
-7
April
-3.8
-7
-2
-3
-1
May
2.7
1
2
3
5
June
7.3
6
9
7
7
July
9.2
8
9
9
9
August
9.9
9
9
9
10
September
7.4
7
7
6
7
October
3.3
2
2
1
4
November
-3.7
-1
-2
-12
-2
December
-6.3
-8
-3
-6
-6
Average
-1.8
-8.2
0.8
0.8
-1.2
0.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
37.0
33
0
41
68
19
February
46.8
60
0
60
32
56
March
36.8
57
36
45
46
29
April
27.5
33
34
26
26
May
25.1
43
9
20
17
June
20.1
38
11
20
22
July
29.4
47
32
42
17
August
28.7
19
42
20
20
September
22.1
1
42
21
23
October
28.6
1
37
36
28
November
36.9
39
52
21
28
December
43.9
33
22
60
42
Average
32.3
51.9
30.1
34.2
31.9
25.6
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
14.6
14
0
15
14
17
February
17.7
18
7
18
18
16
March
14.4
18
15
14
18
16
April
12.4
13
13
14
11
May
11.0
12
10
12
9
June
9.5
11
9
11
9
July
10.6
12
10
12
9
August
12.6
11
14
12
10
September
13.5
13
14
14
14
October
14.7
14
16
18
12
November
14.8
15
16
13
17
December
15.9
17
17
21
14
Average
13.3
16.7
12.8
13.0
14.2
12.1
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
016°
360°
045°
032°
041°
February
017°
068°
063°
090°
124°
March
012°
006°
040°
024°
109°
April
014°
059°
065°
148°
May
014°
357°
115°
137°
June
028°
037°
147°
165°
July
029°
015°
187°
271°
August
014°
005°
180°
237°
September
354°
013°
336°
021°
October
025°
358°
340°
142°
November
010°
034°
007°
020°
December
356°
031°
015°
096°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.