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
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
-2.2
-1
0
-4
0
-1
February
-3.8
2
-1
-4
-3
-1
March
0.6
3
1
-1
3
2
April
3.9
5
3
6
4
May
8.5
10
9
9
8
June
12.2
15
11
13
11
July
16.2
17
14
20
17
August
18.8
19
19
21
19
September
16.2
18
17
18
14
October
9.9
11
10
14
7
November
3.9
5
5
6
6
December
0.6
3
1
1
1
Average
6.5
1.0
8.5
6.7
8.9
7.1
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
-7.6
-5
-4
-11
-4
-5
February
-7.1
-4
-7
-10
-7
-6
March
-4.0
-2
-4
-5
-3
-2
April
-1.7
1
-1
1
-1
May
2.9
4
3
4
3
June
5.8
7
5
7
6
July
9.8
10
8
13
11
August
13.3
13
12
16
15
September
11.4
13
12
13
10
October
6.4
7
5
10
4
November
-1.8
1
1
2
1
December
-4.5
0
-3
-3
-3
Average
1.6
-4.6
3.3
1.6
4.0
2.7
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
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
9.7
15
14
18
13
0
February
9.7
13
16
16
16
0
March
8.8
14
14
16
14
0
April
7.2
12
14
12
0
May
5.9
10
11
10
0
June
7.2
10
10
8
4
July
6.5
6
8
7
8
August
7.8
9
9
10
10
September
9.2
10
10
12
12
October
10.9
12
12
10
14
November
11.3
17
15
15
16
December
10.8
14
16
18
14
Average
9.1
14.1
11.6
12.3
11.7
5.4
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
294°
142°
272°
313°
360°
February
280°
291°
306°
269°
360°
March
307°
017°
285°
282°
360°
April
048°
115°
046°
360°
May
055°
130°
343°
360°
June
052°
217°
137°
132°
July
275°
275°
356°
252°
August
318°
269°
214°
170°
September
088°
321°
269°
260°
October
347°
261°
042°
269°
November
276°
314°
275°
263°
December
277°
173°
259°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.