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
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
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
-5.4
-3
-3
-8
-3
-4
February
-4.2
-2
-5
-6
-4
-3
March
0.0
2
1
-1
1
0
April
4.7
6
5
6
4
May
10.4
11
11
11
11
June
14.1
14
14
15
14
July
16.9
17
18
16
17
August
16.4
16
17
17
17
September
13.1
14
13
14
13
October
8.7
11
10
10
7
November
2.7
3
4
5
4
December
-2.1
1
1
-2
0
Average
5.5
-1.0
7.2
6.7
7.1
6.6
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
-11.9
-8
-7
-15
-7
-9
February
-10.5
-7
-11
-12
-8
-9
March
-5.1
-3
-3
-5
-5
-5
April
0.2
1
1
2
0
May
4.5
6
5
5
4
June
8.0
9
9
8
8
July
10.1
12
10
10
10
August
9.8
10
10
10
10
September
7.8
10
8
9
7
October
4.9
7
5
7
3
November
-2.9
-1
0
1
0
December
-7.5
-4
-4
-7
-5
Average
0.2
-7.8
2.4
1.3
2.0
1.2
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
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
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
14.6
18
15
0
17
14
February
13.9
15
15
0
15
18
March
12.9
16
14
0
19
4
April
10.2
15
0
14
0
May
8.1
13
0
11
0
June
7.1
12
0
13
0
July
6.3
9
0
11
0
August
7.7
9
0
10
0
September
9.0
9
4
11
3
October
11.7
10
12
10
12
November
15.4
15
16
13
15
December
13.1
14
17
0
16
Average
10.9
16.1
12.2
3.0
12.1
5.4
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
278°
320°
360°
300°
312°
February
294°
278°
360°
298°
251°
March
329°
312°
360°
268°
282°
April
329°
360°
350°
360°
May
292°
360°
302°
360°
June
037°
360°
225°
360°
July
177°
360°
251°
360°
August
255°
360°
217°
360°
September
234°
279°
259°
206°
October
261°
217°
337°
280°
November
264°
256°
267°
251°
December
288°
351°
351°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.