Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
2025
2024
2023
2022
2021
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
May
0.0
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 5 km 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
2025
2024
2023
2022
2021
January
-1.7
0.4
2.6
-1.5
1.5
-2.0
February
2.1
1.5
4.0
1.3
1.1
1.3
March
1.7
2.7
3.5
0.1
-3.5
0.4
April
4.5
8.0
2.9
2.7
May
6.9
9.0
10.0
7.0
10.5
8.9
June
12.3
15.8
12.4
12.0
16.6
July
17.3
21.3
20.6
21.8
18.1
August
16.4
20.8
19.1
18.1
18.0
September
12.1
12.8
15.5
13.0
15.0
October
9.0
10.0
12.4
13.4
7.0
November
5.0
6.5
3.5
5.0
4.0
December
1.7
1.1
3.9
0.0
0.9
Average
6.5
3.4
9.7
8.2
9.5
7.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
-4.9
-3.6
-1.4
-2.7
-4.5
-5.7
February
-2.3
-2.3
0.0
-3.0
-3.0
-2.0
March
-2.5
-1.3
-1.9
-1.3
-8.5
-3.0
April
0.4
2.2
0.8
-2.3
May
2.7
1.5
5.2
3.5
5.5
3.2
June
7.3
9.5
6.9
7.7
10.0
July
11.2
14.5
14.4
13.1
11.8
August
10.7
14.0
12.6
12.0
11.8
September
7.6
7.9
10.0
8.0
9.5
October
4.7
5.9
7.7
8.3
3.1
November
1.4
1.7
-1.9
1.8
1.3
December
-2.7
-1.1
-1.7
0.0
-3.5
Average
2.6
-1.2
4.9
4.2
4.6
3.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
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
May
0.0
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
2025
2024
2023
2022
2021
January
8.8
11
6
3
14
11
February
9.4
8
11
12
13
10
March
7.5
9
9
3
10
10
April
5.4
8
0
8
May
6.1
7
7
0
6
8
June
5.6
6
0
5
7
July
7.8
7
8
8
8
August
7.2
6
8
7
6
September
7.2
7
9
7
7
October
7.8
7
7
7
10
November
8.2
7
11
7
8
December
8.3
3
12
0
13
Average
7.3
8.9
7.0
5.7
7.7
8.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
096°
328°
079°
062°
324°
February
079°
074°
065°
054°
007°
March
109°
267°
058°
095°
088°
April
327°
360°
036°
May
348°
316°
360°
328°
297°
June
291°
312°
311°
331°
July
302°
304°
331°
311°
August
310°
322°
348°
302°
September
338°
074°
309°
315°
October
313°
309°
355°
097°
November
332°
323°
006°
117°
December
028°
007°
360°
041°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.