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
-5.9
-3
-2
-7
-2
-4
February
-4.0
-1
-5
-4
-3
-4
March
0.4
2
1
0
2
0
April
5.4
6
6
8
5
May
13.2
14
14
14
14
June
18.9
18
19
21
21
July
22.9
24
23
21
22
August
22.2
20
23
24
21
September
17.5
19
18
18
16
October
11.8
14
14
13
7
November
3.8
4
5
6
5
December
-1.0
2
2
-1
1
Average
7.6
-1.3
9.4
9.6
10.1
7.6
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
-12.4
-11
-9
-16
-8
-11
February
-12.0
-9
-15
-13
-10
-11
March
-7.4
-4
-5
-7
-7
-8
April
-2.8
-1
0
1
-2
May
3.6
4
4
4
4
June
9.7
11
10
12
10
July
14.1
17
14
12
14
August
14.0
13
15
15
13
September
9.6
12
10
11
8
October
4.7
7
6
6
1
November
-3.7
-3
-1
0
-2
December
-8.8
-4
-4
-7
-5
Average
0.0
-8.0
2.2
1.8
2.4
-1.9
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
7.2
8
6
8
6
6
February
7.7
7
7
7
8
8
March
7.5
6
6
8
9
8
April
6.9
7
7
6
8
May
6.7
7
6
6
8
June
5.3
5
5
5
5
July
5.0
4
5
5
5
August
5.1
5
4
5
7
September
5.5
5
6
6
5
October
6.0
5
6
5
7
November
7.9
8
8
7
7
December
7.9
7
7
9
7
Average
6.5
6.9
5.8
6.1
6.2
6.7
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
290°
304°
288°
301°
300°
February
294°
285°
288°
290°
286°
March
306°
309°
289°
287°
292°
April
294°
314°
037°
285°
May
296°
295°
295°
289°
June
060°
117°
262°
238°
July
125°
269°
265°
164°
August
303°
267°
273°
279°
September
316°
281°
289°
272°
October
317°
279°
294°
301°
November
287°
297°
282°
289°
December
298°
342°
292°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.