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
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
-2.8
0
-2
-3
0
0
February
-1.5
2
-1
-2
0
-1
March
1.1
4
-1
1
0
3
April
4.9
7
5
0
6
May
11.1
14
0
12
June
15.0
15
17
0
19
July
18.2
11
21
0
24
August
18.7
20
22
0
22
September
16.6
20
19
0
18
October
13.4
14
14
15
12
November
6.4
7
8
7
9
December
1.8
4
3
4
0
Average
8.1
2.0
10.2
10.2
2.2
10.3
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
-7.7
-4
-5
-12
0
-5
February
-6.4
-3
-8
-9
0
-6
March
-4.9
-1
-1
-4
0
-2
April
0.6
4
1
0
1
May
4.8
6
0
6
June
9.7
15
11
0
13
July
14.6
9
17
0
20
August
15.5
17
18
0
19
September
12.9
16
15
0
14
October
9.0
10
9
12
7
November
1.4
2
3
3
3
December
-3.5
0
-1
-2
0
Average
3.6
-3.3
6.3
4.9
1.0
5.8
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
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
14.5
16
0
16
0
17
February
13.7
14
0
15
0
17
March
12.0
14
0
13
0
14
April
11.6
0
11
0
15
May
10.3
9
0
13
June
9.4
0
10
0
11
July
8.6
0
10
0
11
August
9.4
11
10
0
11
September
10.1
9
11
0
14
October
15.1
15
13
12
15
November
17.6
19
17
16
16
December
13.5
15
7
18
0
Average
12.2
14.5
12.3
11.7
3.1
12.7
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
255°
360°
165°
360°
296°
February
270°
360°
292°
360°
284°
March
276°
360°
280°
360°
286°
April
360°
296°
360°
295°
May
164°
360°
310°
June
360°
268°
360°
274°
July
360°
263°
360°
290°
August
313°
304°
360°
306°
September
283°
327°
360°
250°
October
282°
177°
073°
244°
November
253°
214°
262°
236°
December
318°
121°
198°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.