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
68.8
55
66
58
69
65
February
70.9
78
54
63
72
82
March
73.7
81
65
75
69
76
April
76.5
69
65
86
74
May
83.6
69
89
90
85
June
83.2
91
89
85
78
July
82.7
69
81
84
84
August
90.1
93
86
87
91
September
81.5
70
81
85
79
October
80.7
69
88
66
75
November
76.6
75
76
87
68
December
72.7
70
62
76
76
Average
77.8
73.7
71.0
76.2
79.8
78.0
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
-18.8
-15
-16
-22
-11
-17
February
-20.8
-17
-22
-22
-14
-20
March
-12.8
-10
-9
-12
-12
-13
April
-5.9
-2
-4
0
-5
May
3.2
3
4
7
0
June
9.9
12
14
9
9
July
15.1
18
16
13
16
August
14.9
15
14
15
17
September
8.7
8
11
10
9
October
3.1
5
4
6
1
November
-5.4
-4
-5
-3
-5
December
-10.4
-6
-5
-10
-10
Average
-3.2
-14.1
-1.6
-2.4
0.8
-2.5
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
-21.9
-18
-19
-24
-14
-21
February
-23.2
-21
-26
-26
-17
-24
March
-16.9
-13
-13
-16
-16
-18
April
-8.5
-5
-7
-3
-8
May
-1.9
0
0
2
-2
June
5.6
8
9
5
5
July
10.2
13
11
10
11
August
10.2
10
10
10
11
September
5.1
5
7
6
5
October
0.5
3
3
1
-1
November
-7.1
-6
-7
-6
-8
December
-13.8
-8
-8
-12
-13
Average
-7.7
-18.7
-4.5
-6.9
-3.3
-5.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
79.9
88
90
89
52
88
February
75.6
61
99
87
65
74
March
61.1
56
60
65
69
69
April
46.4
47
62
30
39
May
31.6
34
29
18
33
June
20.5
4
13
28
24
July
15.6
18
8
14
12
August
18.8
10
23
22
15
September
31.3
11
27
33
35
October
42.1
54
48
22
55
November
65.6
70
63
55
85
December
68.7
50
68
79
71
Average
48.0
65.2
47.1
48.9
38.3
48.4
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
11.5
13
12
14
8
11
February
11.4
10
13
12
10
10
March
10.4
9
9
10
12
11
April
9.8
8
11
9
10
May
10.7
10
12
11
10
June
9.7
9
9
11
9
July
7.8
7
8
8
7
August
8.6
8
8
9
7
September
9.6
8
10
10
10
October
10.6
10
13
9
12
November
11.7
14
11
10
14
December
11.9
11
13
12
13
Average
10.2
10.4
9.6
10.9
9.8
10.2
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
219°
204°
168°
181°
178°
February
178°
201°
174°
177°
175°
March
159°
096°
180°
225°
185°
April
266°
138°
129°
346°
May
276°
196°
081°
313°
June
319°
301°
273°
320°
July
240°
260°
309°
291°
August
213°
237°
186°
304°
September
293°
313°
133°
252°
October
260°
252°
169°
244°
November
173°
263°
156°
230°
December
176°
148°
202°
162°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.