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
-5.0
-7
-3
-5
-3
-7
February
-7.6
0
-4
-3
-10
-3
March
1.3
0
-5
4
9
2
April
9.0
7
6
11
9
May
18.5
21
17
16
18
June
23.7
25
23
27
22
July
27.6
27
27
31
25
August
27.0
27
30
26
29
September
21.0
23
25
23
21
October
10.7
10
13
14
7
November
1.3
4
-2
6
2
December
-4.4
4
-11
-8
-1
Average
8.9
-3.5
11.4
11.2
11.8
10.4
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
-14.8
-15
-11
-14
-10
-15
February
-16.6
-9
-13
-15
-19
-12
March
-9.5
-9
-14
-7
-4
-8
April
-3.3
-3
-4
-2
-4
May
5.4
9
5
4
4
June
10.4
12
10
12
10
July
13.1
13
13
16
12
August
12.5
13
14
12
12
September
7.5
9
9
9
7
October
-1.6
0
2
2
-3
November
-8.8
-5
-10
-4
-7
December
-12.5
-5
-19
-17
-8
Average
-2.0
-12.8
0.4
-1.5
-1.8
-1.0
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
10.5
9
9
13
11
10
February
10.9
14
12
11
12
10
March
10.3
9
10
12
11
10
April
11.0
10
13
10
12
May
9.5
8
12
10
10
June
9.6
7
10
10
10
July
8.7
9
8
8
9
August
8.8
9
9
9
10
September
9.4
9
10
10
11
October
10.8
11
10
10
11
November
11.3
10
13
12
13
December
10.1
10
10
10
11
Average
10.1
10.5
9.4
10.8
10.2
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
278°
282°
280°
258°
274°
February
353°
267°
293°
283°
256°
March
272°
225°
288°
250°
265°
April
281°
310°
305°
296°
May
148°
280°
219°
202°
June
199°
265°
286°
273°
July
296°
308°
119°
251°
August
286°
263°
283°
243°
September
228°
256°
270°
275°
October
291°
281°
246°
280°
November
259°
280°
256°
253°
December
258°
301°
272°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.