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
83.4
92
74
77
92
86
February
83.8
79
78
76
85
93
March
77.1
65
75
75
94
86
April
78.2
78
69
78
87
May
86.4
83
79
91
92
June
82.7
57
76
97
91
July
90.0
75
94
96
85
August
91.5
75
96
98
95
September
87.9
78
80
91
96
October
88.7
80
88
89
94
November
86.7
86
80
95
92
December
82.0
78
64
89
80
Average
84.8
76.7
75.6
79.8
91.3
89.9
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
-5.8
-3
-2
-8
-2
-4
February
-3.1
0
-4
-3
-3
-3
March
1.4
3
2
1
4
1
April
7.2
8
8
9
6
May
15.9
16
17
16
17
June
21.6
19
21
24
24
July
25.6
26
26
24
25
August
24.4
21
25
27
25
September
19.4
21
19
19
20
October
13.3
15
16
14
11
November
4.0
4
6
6
6
December
-2.9
2
1
-1
1
Average
9.1
0.0
10.7
11.2
11.6
10.7
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
-14.6
-13
-10
-18
-9
-12
February
-14.3
-11
-17
-14
-12
-13
March
-8.5
-5
-6
-8
-8
-9
April
-2.7
-1
-1
1
-2
May
3.9
4
5
4
5
June
9.9
10
10
12
11
July
14.5
18
15
13
15
August
13.6
13
15
15
13
September
9.1
11
10
10
8
October
3.8
6
4
5
2
November
-4.3
-4
-2
-2
-2
December
-9.2
-5
-5
-9
-7
Average
-1.3
-10.5
1.6
1.0
1.7
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
38.0
34
49
49
19
32
February
30.6
33
40
40
26
16
March
31.6
40
39
39
12
22
April
22.7
12
34
29
16
May
15.0
22
16
13
14
June
14.8
28
24
8
3
July
8.4
12
12
7
9
August
11.5
28
14
5
8
September
13.5
24
11
19
6
October
12.9
27
8
13
11
November
21.5
26
31
15
14
December
28.3
28
49
21
29
Average
20.8
36.0
27.0
26.0
14.8
13.4
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
7.1
8
6
8
6
6
February
8.0
8
9
8
8
8
March
8.2
7
7
9
9
8
April
7.4
7
7
7
9
May
7.3
8
6
8
8
June
6.5
7
6
7
7
July
5.9
5
7
6
6
August
5.8
5
5
6
7
September
6.2
5
6
6
7
October
6.5
6
6
5
7
November
7.7
8
8
7
7
December
7.5
7
8
8
7
Average
7.0
7.6
6.5
6.9
7.0
7.3
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
284°
319°
280°
298°
296°
February
284°
287°
282°
290°
266°
March
326°
345°
285°
271°
302°
April
314°
334°
010°
302°
May
337°
329°
316°
297°
June
045°
207°
245°
265°
July
198°
258°
264°
144°
August
271°
246°
226°
271°
September
013°
278°
259°
245°
October
287°
225°
335°
256°
November
269°
282°
270°
261°
December
285°
004°
276°
266°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.