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
-6.8
-9
-6
-5
-4
-6
February
-7.7
-2
-4
-3
-12
0
March
2.0
0
-4
5
6
3
April
11.4
9
11
14
10
May
20.8
25
20
18
19
June
25.2
27
24
28
24
July
28.3
28
30
31
26
August
28.1
28
32
27
29
September
22.0
24
26
24
22
October
12.5
12
17
16
9
November
1.4
5
-4
6
1
December
-4.5
5
-11
-9
-3
Average
9.7
-4.3
12.5
12.4
12.2
11.3
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
-15.1
-19
-13
-16
-12
-16
February
-18.9
-14
-14
-15
-21
-12
March
-10.4
-10
-15
-8
-5
-9
April
-3.2
-3
-4
-3
-4
May
4.7
8
5
3
3
June
10.1
11
10
11
10
July
11.5
11
12
13
11
August
10.8
12
12
11
10
September
6.1
7
8
6
6
October
-2.4
-1
1
-1
-2
November
-9.5
-5
-12
-7
-9
December
-14.2
-7
-22
-20
-12
Average
-4.5
-15.8
-1.2
-2.3
-2.1
-2.0
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
8.5
7
6
11
11
8
February
8.8
8
10
9
10
10
March
8.8
9
9
5
9
11
April
10.4
10
9
10
12
May
10.6
9
11
11
12
June
10.0
9
11
10
10
July
8.2
9
8
8
9
August
8.1
9
8
8
10
September
9.5
9
9
11
11
October
10.3
10
10
10
11
November
9.3
8
10
10
11
December
8.5
9
8
9
9
Average
9.2
8.2
8.7
9.1
9.6
10.3
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
242°
191°
242°
267°
280°
February
267°
209°
250°
286°
264°
March
111°
111°
243°
262°
288°
April
154°
176°
316°
304°
May
124°
232°
298°
214°
June
201°
287°
289°
289°
July
292°
275°
055°
258°
August
280°
263°
274°
282°
September
227°
236°
258°
288°
October
224°
263°
231°
283°
November
222°
239°
240°
282°
December
230°
199°
252°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.