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
73.1
63
68
78
80
76
February
75.5
77
65
80
82
83
March
83.3
83
79
71
94
85
April
82.4
74
83
91
88
May
89.8
92
90
95
93
June
90.2
77
95
91
92
July
92.2
90
90
89
95
August
87.9
92
87
86
85
September
86.1
86
79
89
92
October
80.6
71
83
77
88
November
75.8
80
85
82
80
December
71.2
61
68
75
74
Average
82.6
75.0
79.0
83.4
86.7
86.9
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
-7.8
-5
-4
-10
-5
-4
February
-5.8
-1
-3
-6
-6
-4
March
0.9
4
1
0
4
2
April
8.0
9
8
12
7
May
17.5
19
20
18
16
June
22.7
24
22
23
24
July
25.2
25
25
24
26
August
23.3
22
24
25
23
September
19.0
21
19
18
17
October
11.3
12
12
15
8
November
2.4
3
5
3
6
December
-4.6
0
-2
-2
-3
Average
8.4
-1.2
10.6
10.2
10.8
9.8
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
-15.9
-11
-11
-22
-11
-11
February
-14.1
-10
-14
-17
-15
-14
March
-9.6
-5
-9
-9
-7
-7
April
-2.1
-1
-2
1
-3
May
5.7
6
8
5
5
June
11.1
12
11
12
11
July
14.2
14
13
14
16
August
13.3
12
14
15
13
September
9.4
10
10
9
8
October
3.7
5
3
7
1
November
-5.3
-5
-2
-4
-2
December
-11.7
-5
-9
-10
-9
Average
-1.2
-9.4
1.3
0.2
1.4
0.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
41.1
43
42
51
20
50
February
37.1
24
46
42
24
35
March
24.3
28
30
37
13
19
April
24.5
30
29
15
19
May
14.8
12
12
11
14
June
11.0
11
6
17
8
July
8.3
10
10
12
8
August
10.4
13
13
6
14
September
13.3
8
17
17
14
October
22.5
34
21
20
17
November
31.3
26
23
23
30
December
34.6
20
41
32
29
Average
22.3
31.0
22.2
22.6
16.4
19.5
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
8.9
9
9
9
8
9
February
9.8
9
10
11
9
10
March
10.1
10
10
10
12
10
April
10.1
10
10
10
10
May
9.4
10
10
9
9
June
8.6
8
9
9
9
July
7.8
7
9
8
7
August
7.7
8
8
8
7
September
8.6
8
9
9
9
October
9.4
9
10
8
9
November
9.4
9
11
9
10
December
8.9
9
10
9
10
Average
9.1
9.4
8.8
9.3
9.0
8.8
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
281°
012°
214°
352°
347°
February
244°
219°
265°
245°
251°
March
324°
002°
253°
244°
198°
April
199°
203°
015°
293°
May
002°
197°
262°
348°
June
026°
240°
232°
245°
July
250°
244°
355°
257°
August
327°
272°
219°
306°
September
239°
324°
244°
220°
October
274°
195°
052°
232°
November
232°
225°
222°
215°
December
043°
077°
206°
322°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.