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
61.2
49
64
68
48
61
February
70.6
59
61
71
83
70
March
78.0
71
77
76
73
80
April
79.2
71
69
92
87
May
83.5
86
87
83
78
June
79.7
78
69
86
79
July
77.3
61
73
83
82
August
80.2
74
75
78
90
September
75.2
77
77
66
62
October
73.1
67
76
70
67
November
51.6
53
52
43
47
December
53.5
36
76
54
46
Average
72.8
60.9
68.9
72.8
74.2
73.2
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
-15.1
-12
-14
-20
-11
-14
February
-15.6
-11
-16
-17
-12
-12
March
-8.8
-5
-8
-8
-6
-7
April
0.3
1
1
4
-1
May
9.9
13
12
10
8
June
18.0
23
19
17
18
July
21.2
22
19
22
24
August
19.2
20
20
20
20
September
14.0
18
16
15
12
October
6.7
8
9
11
2
November
-4.9
-3
-2
-1
-3
December
-10.3
-5
-8
-10
-10
Average
1.8
-10.5
4.8
4.0
5.1
3.1
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
-23.5
-20
-22
-28
-17
-21
February
-25.3
-19
-29
-29
-23
-23
March
-18.0
-16
-16
-19
-18
-19
April
-10.5
-7
-8
-7
-10
May
-2.9
1
1
-1
-3
June
5.9
10
8
4
7
July
10.0
12
9
9
14
August
9.2
10
10
11
10
September
5.7
7
6
8
6
October
0.7
2
3
5
-3
November
-9.9
-8
-7
-4
-8
December
-16.2
-11
-14
-17
-17
Average
-8.8
-19.8
-5.5
-6.6
-5.8
-6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
76.7
87
69
88
52
79
February
63.5
54
66
75
50
66
March
48.7
57
56
53
54
44
April
30.4
34
36
13
33
May
24.6
23
21
24
32
June
17.3
2
33
11
22
July
18.5
14
26
16
19
August
19.1
18
25
25
9
September
28.9
13
26
39
44
October
38.7
28
37
27
65
November
66.4
67
72
51
62
December
77.6
76
59
86
81
Average
41.0
64.1
35.1
41.2
33.1
41.3
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
8.6
10
7
11
6
8
February
9.3
8
10
10
8
10
March
9.3
10
8
9
11
10
April
9.3
9
9
8
11
May
9.5
10
11
9
9
June
8.8
8
10
8
8
July
9.1
8
10
8
8
August
8.4
7
9
9
8
September
9.7
8
10
10
12
October
8.9
8
10
7
9
November
9.4
10
10
9
9
December
9.3
10
8
11
9
Average
9.1
9.0
8.4
9.8
8.7
9.1
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
225°
200°
226°
222°
220°
February
242°
204°
222°
186°
238°
March
242°
299°
259°
256°
186°
April
209°
059°
040°
262°
May
276°
234°
258°
277°
June
063°
182°
270°
307°
July
236°
257°
254°
205°
August
296°
230°
227°
261°
September
234°
239°
203°
234°
October
272°
210°
154°
216°
November
223°
232°
217°
212°
December
221°
130°
207°
209°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.