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
67.4
56
66
64
70
89
February
63.7
59
67
57
65
61
March
70.5
65
61
62
86
78
April
71.3
71
51
61
80
May
74.9
70
71
78
71
June
66.8
42
71
83
65
July
75.2
58
72
82
81
August
79.2
70
74
91
79
September
81.7
66
82
76
89
October
80.5
60
80
83
84
November
76.8
86
67
73
72
December
72.5
72
66
66
78
Average
73.4
60.2
63.9
68.0
77.4
77.2
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
-5.6
-4
-4
-5
-2
-6
February
-6.3
-3
-9
-7
-4
-4
March
-2.2
0
0
-3
-1
-3
April
2.0
3
2
4
2
May
7.1
8
8
8
8
June
13.6
12
16
16
14
July
19.3
21
19
18
19
August
19.3
18
21
20
19
September
14.6
15
16
15
16
October
9.1
10
11
8
9
November
2.4
2
1
5
2
December
-1.5
1
1
1
2
Average
5.2
-3.8
6.4
6.9
7.5
6.4
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
-12.1
-13
-11
-14
-6
-14
February
-15.7
-9
-19
-17
-10
-14
March
-9.9
-6
-6
-11
-8
-11
April
-4.7
-3
-2
-1
-4
May
0.5
0
1
2
1
June
5.1
4
6
7
6
July
10.4
13
10
10
10
August
11.7
12
13
12
11
September
7.3
8
8
8
7
October
3.1
4
5
3
3
November
-4.7
-5
-5
0
-4
December
-7.1
-6
-4
-8
-4
Average
-2.2
-10.9
-1.4
-1.3
0.8
-1.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
48.3
61
51
63
41
20
February
46.1
57
44
59
47
43
March
35.6
35
51
43
27
28
April
23.8
21
42
26
19
May
19.4
27
21
24
21
June
20.3
33
22
11
15
July
13.4
20
23
12
8
August
12.5
24
18
4
13
September
13.5
15
15
17
6
October
12.4
14
14
13
10
November
27.4
28
43
20
16
December
36.3
49
35
30
27
Average
25.6
50.2
30.7
31.9
20.8
17.3
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
13.3
15
13
14
12
13
February
14.2
15
15
14
13
14
March
14.5
15
13
15
15
16
April
13.5
13
14
14
13
May
12.9
14
13
13
13
June
12.3
13
15
11
11
July
12.2
10
16
11
11
August
10.7
11
6
13
13
September
12.6
12
11
13
14
October
12.8
14
13
12
13
November
12.9
14
11
13
11
December
13.7
14
15
13
12
Average
13.1
15.1
12.6
13.0
12.7
12.7
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
252°
270°
241°
300°
282°
February
264°
242°
256°
288°
245°
March
156°
352°
281°
227°
262°
April
342°
020°
063°
228°
May
333°
257°
297°
269°
June
014°
203°
218°
208°
July
195°
191°
228°
207°
August
135°
194°
231°
227°
September
010°
212°
253°
227°
October
275°
220°
349°
224°
November
236°
298°
171°
245°
December
263°
057°
266°
182°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.