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
81.7
77
77
86
100
February
71.3
77
70
64
71
85
March
81.5
87
77
76
83
April
91.1
88
89
95
May
91.7
86
94
95
June
85.2
88
64
88
July
75.3
66
75
76
August
64.7
70
69
74
September
63.1
72
78
78
October
71.9
80
72
80
November
68.5
63
57
93
December
61.9
63
52
53
Average
78.3
82.1
75.9
73.5
81.4
84.3
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
-9.4
-3
-8
-11
-24
February
-6.1
-3
-7
-13
-7
-8
March
-3.7
-2
-1
-6
-5
April
5.5
0
9
7
May
12.3
10
12
15
June
17.1
16
12
16
July
17.3
10
17
17
August
15.8
16
15
15
September
11.7
10
12
11
October
4.9
4
4
2
November
-4.1
-1
-2
-14
December
-8.7
-10
-5
-6
Average
2.9
-3.2
3.3
5.5
5.1
-9.9
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
-17.6
-9
-15
-18
-29
February
-14.6
-8
-15
-19
-16
-19
March
-13.9
-12
-12
-17
-16
April
-5.9
-13
0
-2
May
2.7
2
1
3
June
7.5
8
4
8
July
9.7
5
10
10
August
8.8
9
8
8
September
4.8
3
6
3
October
-2.9
-3
-2
-3
November
-11.7
-6
-9
-24
December
-14.3
-17
-13
-13
Average
-6.9
-10.2
-5.6
-2.1
-4.7
-19.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.4
31
28
20
33
February
28.2
33
54
55
21
36
March
23.6
30
40
31
22
April
12.0
21
6
11
May
10.4
32
8
7
June
8.6
21
3
21
July
17.8
33
26
33
August
14.4
24
24
18
September
18.5
24
33
19
October
15.0
14
16
17
November
29.4
46
48
17
December
37.7
54
39
37
Average
19.7
31.1
30.7
22.3
20.1
29.2
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
4.9
7
4
5
2
February
5.4
7
6
3
0
7
March
4.9
6
6
0
5
April
4.9
5
6
3
May
5.2
5
5
6
June
3.9
5
2
4
July
3.7
3
3
4
August
4.1
4
4
4
September
4.4
4
5
4
October
5.1
4
5
5
November
4.9
5
5
2
December
4.8
4
6
5
Average
4.9
6.5
4.6
4.3
3.7
5.7
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
092°
076°
055°
221°
February
085°
156°
064°
360°
082°
March
088°
123°
360°
109°
April
055°
098°
073°
May
105°
226°
090°
June
108°
069°
106°
July
111°
146°
162°
August
127°
194°
183°
September
226°
114°
079°
October
086°
085°
071°
November
092°
069°
023°
December
090°
089°
125°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.