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
-8.4
-9
-8
-9
-5
-8
February
-9.9
-2
-7
-9
-13
-2
March
0.5
-2
-5
-1
8
4
April
9.5
6
6
13
10
May
20.4
23
19
18
20
June
24.7
27
25
27
23
July
27.3
27
27
30
26
August
26.8
27
28
25
29
September
21.3
24
24
24
21
October
10.7
11
12
14
8
November
-1.7
2
-3
3
1
December
-6.8
1
-12
-10
-3
Average
8.3
-5.6
10.9
9.7
11.1
10.8
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
-17.0
-18
-16
-20
-14
-16
February
-19.3
-12
-17
-21
-23
-15
March
-11.8
-11
-15
-10
-6
-8
April
-4.2
-5
-3
-3
-6
May
4.6
8
5
3
4
June
10.4
13
9
11
10
July
12.3
11
13
15
12
August
10.9
11
13
12
11
September
6.2
8
7
6
5
October
-2.3
0
0
1
-3
November
-9.0
-6
-11
-7
-9
December
-15.5
-9
-20
-19
-13
Average
-4.2
-14.3
-2.8
-3.5
-2.0
-3.6
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
9.8
8
8
12
10
10
February
9.7
10
11
11
11
9
March
11.1
10
11
12
12
10
April
11.8
11
13
11
13
May
10.8
9
12
11
11
June
10.6
8
11
11
12
July
9.3
9
9
8
10
August
8.8
9
8
9
9
September
10.1
10
11
10
11
October
11.1
11
11
10
12
November
10.3
10
12
11
11
December
9.2
9
10
10
9
Average
10.2
9.5
9.6
10.9
10.4
10.6
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
273°
320°
306°
229°
262°
February
269°
300°
302°
286°
265°
March
329°
115°
299°
214°
281°
April
094°
045°
328°
308°
May
115°
322°
223°
163°
June
187°
310°
290°
297°
July
302°
355°
114°
255°
August
293°
197°
341°
244°
September
169°
229°
287°
295°
October
325°
306°
214°
293°
November
259°
296°
258°
258°
December
246°
350°
276°
261°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.