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
71.1
57
78
79
61
74
February
74.4
65
70
65
84
80
March
81.4
78
78
71
86
85
April
83.8
79
79
97
87
May
89.3
95
88
94
87
June
88.5
74
89
91
90
July
95.0
91
94
96
96
August
91.7
89
92
97
94
September
88.0
83
84
88
93
October
77.5
62
86
77
81
November
67.2
64
65
72
74
December
67.7
70
61
74
54
Average
81.3
67.6
78.6
81.0
86.3
84.4
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
-9.7
-7
-6
-13
-7
-6
February
-6.0
-3
-6
-8
-7
-5
March
-1.6
2
-1
-1
3
1
April
7.0
8
6
13
6
May
16.3
18
20
17
14
June
22.3
24
22
23
23
July
25.0
25
24
23
26
August
22.6
22
23
25
22
September
18.1
21
18
17
16
October
10.3
12
12
13
6
November
0.5
-1
4
2
4
December
-6.6
-2
-4
-4
-5
Average
7.2
-3.6
9.5
9.1
9.9
8.5
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
-18.1
-14
-16
-27
-14
-15
February
-18.6
-13
-19
-22
-19
-16
March
-12.6
-8
-11
-11
-10
-11
April
-4.4
-2
-3
-1
-5
May
3.9
4
7
4
2
June
10.1
11
10
12
11
July
13.3
14
12
12
16
August
11.7
11
12
15
12
September
8.0
9
8
8
7
October
2.5
5
3
5
-1
November
-7.4
-7
-4
-5
-3
December
-14.1
-10
-12
-15
-13
Average
-3.0
-12.2
-1.1
-2.2
-1.4
-2.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
48.4
56
34
44
42
57
February
46.5
55
54
52
25
49
March
31.9
36
37
44
21
28
April
24.9
31
26
10
20
May
13.8
10
11
7
16
June
10.9
4
15
11
13
July
6.9
11
12
6
8
August
9.8
12
11
5
11
September
13.9
13
20
17
14
October
27.9
36
23
16
30
November
49.1
57
47
41
35
December
49.8
31
49
46
65
Average
27.8
48.0
25.5
26.9
18.1
25.7
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
7.3
7
7
8
7
7
February
8.2
8
8
9
7
9
March
8.7
9
8
8
10
8
April
8.5
9
8
8
8
May
8.0
9
8
8
8
June
7.6
7
8
8
7
July
7.0
7
7
7
6
August
6.8
7
7
7
7
September
7.2
6
7
9
8
October
7.9
8
9
6
7
November
8.1
9
9
8
8
December
7.4
8
7
8
8
Average
7.8
8.1
7.7
7.8
7.6
7.6
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
227°
315°
222°
300°
276°
February
234°
192°
249°
249°
242°
March
227°
333°
248°
257°
206°
April
197°
261°
340°
293°
May
331°
194°
291°
307°
June
010°
225°
254°
225°
July
274°
246°
308°
250°
August
306°
256°
229°
282°
September
266°
290°
217°
215°
October
271°
190°
143°
216°
November
216°
221°
223°
199°
December
224°
150°
194°
249°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.