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
87.0
0
84
60
94
February
77.4
43
57
84
79
March
85.3
85
70
90
April
89.1
89
87
100
May
91.8
82
92
95
June
83.3
91
73
78
July
78.5
79
67
72
August
77.0
62
90
82
September
87.0
86
95
90
October
88.0
0
91
83
91
November
85.3
52
84
92
December
76.1
0
66
82
Average
68.5
42.8
81.1
82.5
84.5
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
-8.2
-11
-9
-8
-14
February
-4.6
-3
-2
-4
-11
March
-3.5
0
-3
-6
April
4.6
3
3
7
May
10.3
11
12
10
June
15.2
18
11
13
July
16.0
15
15
16
August
15.2
14
14
18
September
11.5
11
8
12
October
6.0
3
5
2
6
November
-2.0
-3
-13
0
December
-6.5
2
-4
-7
Average
3.3
-5.8
3.3
5.8
2.9
3.8
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
-15.1
-17
-17
-11
-22
February
-10.4
-9
-9
-8
-19
March
-10.6
-7
-8
-13
April
-3.6
-4
-4
4
May
2.6
1
2
7
June
7.9
8
6
8
July
10.1
9
10
10
August
9.3
9
9
9
September
5.3
6
2
3
October
0.3
-2
-1
-3
0
November
-9.6
-8
-23
-5
December
-12.5
1
-11
-12
Average
-3.1
-10.3
-2.4
-1.0
-4.6
-3.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.2
0
22
60
12
February
28.0
55
59
32
36
March
14.1
24
22
22
April
11.6
19
16
5
May
7.6
1
12
16
June
6.2
2
20
15
July
13.7
24
16
10
August
14.6
34
8
12
September
16.9
33
17
13
October
13.5
0
21
15
15
November
19.7
0
27
22
December
18.7
0
33
32
Average
17.4
54.7
22.1
17.2
15.3
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
12.0
0
13
15
11
February
12.9
17
13
11
10
March
11.3
13
11
11
April
10.1
10
10
13
May
10.0
10
9
14
June
8.4
9
9
9
July
9.0
10
10
8
August
10.0
13
9
8
September
10.3
10
6
10
October
10.6
12
11
11
9
November
10.4
15
9
12
December
12.0
0
15
11
Average
11.3
16.5
12.2
11.0
9.8
9.5
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
360°
348°
326°
354°
February
132°
044°
023°
018°
March
356°
218°
023°
April
048°
006°
072°
May
296°
074°
127°
June
145°
194°
182°
July
188°
194°
217°
August
206°
196°
291°
September
152°
310°
355°
October
281°
337°
336°
095°
November
041°
346°
151°
December
360°
268°
003°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.