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
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
0
May
0.0
0
0
0
0
0
June
0.0
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
2025
2024
2023
2022
2021
January
0.5
-2.7
1.0
2.3
-2.3
1.1
February
2.2
-1.7
4.7
4.2
1.5
-1.4
March
5.7
7.5
7.0
4.7
5.5
8.3
April
10.4
11.4
12.4
9.5
10.0
May
16.9
15.9
18.6
17.6
17.6
17.8
June
23.4
23.8
23.1
22.1
24.1
25.3
July
26.4
26.0
26.3
26.5
25.3
August
25.3
25.1
23.8
25.8
26.8
September
21.9
21.5
21.6
21.8
22.3
October
15.9
17.8
16.3
14.4
17.1
November
8.8
10.8
8.6
10.1
9.0
December
3.8
3.5
6.0
3.6
6.0
Average
13.1
9.2
14.2
13.9
13.6
14.1
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
-5.4
-7.7
-3.1
-1.1
-10.8
-3.3
February
-5.8
-6.0
-2.5
-3.0
-6.0
-7.2
March
-1.2
-1.6
1.1
-1.5
-1.0
0.2
April
3.5
5.0
5.0
3.0
3.7
May
9.1
8.4
11.5
9.5
10.3
9.1
June
15.7
16.1
16.1
16.3
14.9
17.0
July
19.4
19.1
19.3
18.8
18.3
August
18.9
18.6
17.1
19.1
20.6
September
15.7
16.8
16.0
15.4
15.0
October
9.7
10.0
11.0
7.9
12.4
November
3.1
5.7
3.0
3.7
3.2
December
-1.1
-2.6
2.0
-1.8
0.7
Average
6.7
2.4
8.2
7.9
6.7
7.6
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
0
May
0.0
0
0
0
0
0
June
0.0
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
7.5
9
9
8
8
8
February
8.0
8
7
10
10
9
March
8.2
10
9
10
9
9
April
7.6
9
8
8
8
May
7.1
8
6
6
7
7
June
6.9
7
7
7
7
7
July
6.2
6
6
6
7
August
6.7
7
7
7
6
September
7.6
7
8
8
7
October
8.2
8
8
7
9
November
8.0
9
8
8
7
December
7.2
9
8
10
9
Average
7.4
8.2
7.6
7.5
7.7
7.6
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
251°
256°
339°
282°
317°
February
253°
238°
234°
249°
273°
March
268°
302°
341°
279°
289°
April
003°
292°
342°
319°
May
001°
085°
040°
023°
011°
June
306°
306°
038°
267°
225°
July
085°
234°
223°
042°
August
007°
298°
197°
146°
September
037°
056°
360°
262°
October
261°
241°
195°
026°
November
297°
234°
233°
233°
December
293°
340°
048°
213°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.