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
0.0
0
0
0
0
0
February
0.0
0
0
0
March
0.0
0
0
April
0.0
0
0
May
0.0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
December
0.0
0
0
0
0
Average
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
1.2
0
3
2
3
0
February
0.5
1
-1
2
March
1.0
2
2
April
2.8
5
5
May
4.4
6
8
8
June
8.8
10
12
13
July
11.8
17
17
16
August
12.1
17
19
19
September
11.0
17
17
17
October
8.6
13
14
11
12
November
5.9
6
8
9
December
2.6
4
4
3
3
Average
5.7
0.4
8.2
9.4
11.5
6.0
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
-3.1
-5
-2
-4
-1
-6
February
-4.8
-3
-8
-5
March
-3.9
-3
-4
April
-1.6
-1
0
May
0.7
1
2
3
June
4.2
5
7
6
July
7.3
12
11
10
August
8.7
13
14
13
September
7.3
10
13
11
October
4.3
7
7
6
6
November
1.0
0
2
3
December
-2.5
-2
1
-3
-2
Average
1.3
-5.6
2.6
3.7
5.8
0.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
March
0.0
0
0
April
0.0
0
0
May
0.0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
December
0.0
0
0
0
0
Average
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
15.8
17
16
18
18
0
February
18.4
19
18
18
March
14.9
6
16
April
13.1
0
15
May
10.6
10
11
15
June
12.1
13
17
13
July
11.1
10
21
12
August
10.5
10
18
13
September
11.1
11
16
13
October
11.9
14
21
15
0
November
15.1
16
25
15
December
14.1
16
17
17
18
Average
12.3
17.9
11.0
17.5
13.8
2.4
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°
255°
222°
011°
360°
February
312°
303°
242°
March
337°
244°
April
360°
278°
May
244°
233°
242°
June
015°
350°
234°
July
238°
360°
228°
August
215°
360°
248°
September
274°
360°
227°
October
001°
360°
332°
251°
November
349°
359°
219°
December
257°
045°
256°
008°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.