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
80.0
71
61
96
77
84
February
88.8
96
88
93
90
95
March
89.8
93
85
89
90
89
April
92.1
94
90
91
97
94
May
96.6
97
97
96
96
June
97.4
96
99
98
100
July
97.2
99
97
96
97
August
96.4
98
95
98
99
September
93.5
95
97
95
96
October
93.3
91
100
93
92
November
92.2
99
84
99
91
December
84.6
80
85
87
91
Average
91.8
88.9
91.0
93.9
93.3
94.1
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
-5.9
-4
-4
-7
-3
-3
February
-3.7
6
-2
-4
-8
-1
March
5.1
8
2
4
9
7
April
12.0
15
12
9
14
14
May
21.5
23
21
21
20
June
27.3
29
28
30
28
July
28.4
28
28
29
30
August
27.1
28
26
28
28
September
23.7
25
24
25
22
October
13.9
15
17
17
10
November
5.5
8
6
7
8
December
0.2
4
-2
1
1
Average
11.8
6.2
14.2
13.0
14.1
13.5
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
-13.9
-10
-11
-18
-10
-10
February
-13.5
-5
-12
-16
-16
-12
March
-5.8
-3
-7
-4
-2
0
April
1.1
3
2
0
3
1
May
9.6
10
10
9
10
June
16.2
16
15
17
17
July
17.1
15
17
17
19
August
16.1
16
15
16
17
September
12.1
13
10
11
11
October
4.0
5
4
7
2
November
-4.9
-2
-3
-3
-1
December
-8.2
-4
-9
-10
-8
Average
2.1
-4.3
3.6
2.2
3.3
3.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.3
5
17
6
8
13
February
9.7
3
12
8
9
7
March
9.3
9
16
6
10
10
April
11.7
9
15
13
12
8
May
8.2
6
6
10
9
June
4.6
3
3
4
4
July
3.1
1
2
4
3
August
3.0
4
2
3
2
September
5.2
4
4
5
5
October
7.9
9
3
4
11
November
7.6
3
14
2
5
December
9.2
6
18
12
4
Average
6.9
6.9
7.6
6.3
6.8
6.6
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
6.3
6
5
7
5
7
February
7.1
7
6
9
7
7
March
7.7
9
7
8
8
7
April
9.1
10
10
11
8
8
May
7.1
7
8
6
8
June
6.4
5
7
6
8
July
4.8
4
6
4
5
August
4.8
5
5
5
5
September
5.5
5
6
5
6
October
6.7
7
7
5
7
November
7.8
7
8
9
8
December
6.3
6
7
7
6
Average
6.9
8.2
6.1
7.3
6.1
6.8
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
285°
306°
265°
313°
278°
February
267°
304°
290°
271°
274°
March
318°
344°
326°
210°
275°
April
306°
296°
256°
302°
306°
May
123°
177°
236°
022°
June
091°
245°
255°
160°
July
275°
264°
228°
229°
August
246°
211°
218°
221°
September
141°
247°
240°
259°
October
306°
260°
277°
283°
November
253°
261°
272°
250°
December
246°
146°
260°
276°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.