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
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
-2.6
-2
0
0
-1
-3
February
-3.2
-1
-5
-1
-2
-2
March
0.0
3
-1
0
1
-1
April
3.4
2
3
5
4
May
7.9
8
10
9
10
June
14.8
12
16
19
17
July
20.4
23
22
19
19
August
20.8
19
23
21
21
September
15.8
17
17
17
18
October
10.2
11
13
8
11
November
4.7
3
6
8
6
December
0.8
2
1
3
Average
7.1
0.0
7.9
10.0
8.7
8.4
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
-7.5
-7
-5
-7
-4
-8
February
-9.6
-4
-11
-9
-6
-9
March
-6.8
-3
-5
-6
-5
-7
April
-2.2
-2
-1
0
-2
May
1.0
1
2
2
2
June
6.3
4
8
9
8
July
12.1
16
13
11
11
August
13.4
13
15
13
13
September
9.7
10
12
10
11
October
5.2
6
7
5
5
November
0.1
-1
2
3
0
December
-4.5
-2
-4
-1
Average
1.2
-5.2
2.3
3.4
3.0
2.0
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
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
14.5
15
13
14
13
15
February
15.0
15
15
15
15
17
March
14.1
13
15
14
14
15
April
12.6
13
12
13
10
May
11.4
12
10
11
12
June
9.9
11
11
9
9
July
8.3
8
9
5
8
August
7.7
8
9
0
10
September
10.8
10
11
6
12
October
12.5
11
11
15
13
November
12.6
14
15
13
15
December
15.3
15
18
12
Average
11.9
14.0
11.6
11.3
10.2
11.8
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
270°
264°
242°
315°
308°
February
290°
292°
254°
304°
256°
March
196°
356°
259°
253°
306°
April
342°
351°
064°
233°
May
299°
294°
273°
257°
June
033°
261°
225°
191°
July
216°
222°
352°
185°
August
182°
223°
360°
234°
September
321°
328°
248°
240°
October
302°
247°
359°
252°
November
298°
293°
240°
255°
December
283°
281°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.