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
-4.9
-3
-2
-3
-1
-5
February
-4.3
-1
-6
-4
-2
-4
March
0.6
2
2
-1
1
-1
April
4.3
5
4
5
4
May
8.1
8
9
11
9
June
13.4
11
15
18
15
July
18.8
20
19
18
19
August
19.7
19
21
21
21
September
15.3
16
17
16
17
October
9.5
10
12
9
10
November
3.2
3
2
6
4
December
-1.7
2
0
-1
2
Average
6.8
-1.2
7.3
7.9
8.5
7.8
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
-10.9
-10
-8
-10
-4
-10
February
-11.0
-7
-15
-13
-7
-11
March
-6.1
-4
-5
-8
-5
-9
April
-3.7
-2
-1
0
-3
May
0.6
1
1
3
1
June
5.3
4
7
9
6
July
10.9
13
11
11
10
August
12.4
13
14
13
13
September
8.5
9
10
9
9
October
3.9
5
6
4
4
November
-2.5
-2
-2
1
-2
December
-5.2
-4
-3
-5
-2
Average
0.3
-7.1
0.9
1.1
2.5
0.9
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
10.6
13
14
13
11
0
February
13.4
12
27
14
12
0
March
12.4
11
24
13
14
0
April
10.2
22
9
7
0
May
9.8
20
9
12
0
June
8.9
18
9
10
0
July
10.5
15
9
9
0
August
10.1
15
8
11
0
September
12.1
19
9
10
0
October
12.4
15
12
9
0
November
12.0
12
12
11
1
December
10.7
14
11
15
11
Average
11.2
11.9
18.1
10.2
10.7
0.4
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°
337°
275°
300°
360°
February
290°
360°
289°
313°
360°
March
299°
360°
297°
286°
360°
April
360°
354°
101°
360°
May
360°
304°
284°
360°
June
360°
097°
273°
360°
July
360°
255°
141°
360°
August
360°
182°
271°
360°
September
360°
346°
291°
360°
October
337°
276°
334°
360°
November
281°
310°
253°
300°
December
285°
110°
301°
310°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.