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
February
0.0
0
0
0
0
March
0.0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
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
-1.9
-1.0
-1.6
1.9
-1.9
February
-2.9
-3.2
0.1
-2.1
-1.7
March
0.9
2.9
0.2
1.3
April
5.1
5.0
4.9
5.0
May
9.3
10.9
11.4
11.4
June
13.9
17.8
15.9
17.0
July
18.5
23.3
22.6
22.3
20.3
August
16.9
23.1
20.3
23.1
23.5
September
14.3
20.1
19.6
18.8
19.6
October
12.1
13.5
15.0
17.8
14.0
November
7.3
8.1
6.4
8.6
9.0
December
2.7
2.7
4.2
4.5
3.0
Average
7.6
-2.2
10.4
10.1
11.1
14.7
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
-7.9
-7.4
-5.2
-4.7
-8.0
February
-8.4
-9.4
-5.7
-10.9
-8.5
March
-4.2
-2.3
-4.3
-4.0
April
-1.9
0.6
-1.6
0.4
May
3.6
5.4
4.0
5.0
June
8.9
11.5
10.0
11.3
July
13.3
17.3
17.3
16.3
15.0
August
12.4
17.1
15.6
17.6
17.3
September
10.1
14.3
14.3
13.3
13.5
October
6.7
7.7
9.4
8.9
8.8
November
1.9
3.9
0.7
2.7
3.3
December
-3.6
-3.2
-1.5
0.5
-3.2
Average
2.3
-8.4
5.2
4.6
4.9
8.9
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
February
0.0
0
0
0
0
March
0.0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
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
13.7
14
14
14
15
February
12.6
3
14
14
16
March
13.2
12
12
13
April
12.1
12
10
13
May
11.2
9
12
12
June
9.6
10
11
11
July
7.7
9
9
10
9
August
9.7
9
10
9
10
September
11.5
11
10
13
11
October
12.0
13
11
10
11
November
14.6
16
13
15
13
December
12.9
13
15
16
14
Average
11.2
8.5
11.4
11.5
12.4
11.2
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
278°
301°
337°
276°
February
306°
317°
298°
281°
March
193°
338°
257°
April
359°
298°
301°
May
045°
282°
286°
June
238°
096°
161°
July
212°
169°
211°
198°
August
229°
190°
163°
202°
September
221°
303°
296°
206°
October
294°
274°
223°
323°
November
339°
268°
274°
254°
December
237°
306°
027°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.