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
78.8
83
78
69
78
87
May
85.6
80
83
79
91
92
June
83.2
88
57
76
97
91
July
90.0
90
75
94
96
85
August
91.2
89
75
96
98
95
September
87.9
87
78
80
91
96
October
88.7
89
80
88
89
94
November
86.7
86
80
95
92
December
82.0
78
64
89
80
Average
85.6
83.8
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
7.4
9
8
8
9
6
May
16.0
16
16
17
16
17
June
21.8
24
19
21
24
24
July
25.8
28
26
26
24
25
August
24.5
25
21
25
27
25
September
19.6
21
21
19
19
20
October
13.4
14
15
16
14
11
November
4.0
4
6
6
6
December
-2.9
2
1
-1
1
Average
10.8
13.4
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
-2.8
-1
-1
-1
1
-2
May
4.1
6
4
5
4
5
June
10.2
13
10
10
12
11
July
14.7
16
18
15
13
15
August
13.6
14
13
15
15
13
September
9.2
10
11
10
10
8
October
3.7
4
6
4
5
2
November
-4.3
-4
-2
-2
-2
December
-9.2
-5
-5
-9
-7
Average
0.9
3.0
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
22.5
21
12
34
29
16
May
14.1
9
22
16
13
14
June
15.2
19
28
24
8
3
July
8.5
9
12
12
7
9
August
12.0
15
28
14
5
8
September
13.3
12
24
11
19
6
October
14.0
21
27
8
13
11
November
21.5
26
31
15
14
December
28.3
28
49
21
29
Average
18.9
20.5
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
7.5
8
7
7
7
9
May
7.1
6
8
6
8
8
June
6.5
6
7
6
7
7
July
5.8
6
5
7
6
6
August
5.8
5
5
5
6
7
September
6.1
5
5
6
6
7
October
6.6
7
6
6
5
7
November
7.7
8
8
7
7
December
7.5
7
8
8
7
Average
6.9
6.5
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
344°
314°
334°
010°
302°
May
034°
337°
329°
316°
297°
June
284°
045°
207°
245°
265°
July
232°
198°
258°
264°
144°
August
268°
271°
246°
226°
271°
September
275°
013°
278°
259°
245°
October
270°
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.