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
-10.4
-9
-9
-14
-6
-8
February
-10.4
-3
-8
-14
-13
-8
March
-1.2
-2
-6
-3
4
0
April
5.9
5
3
7
6
May
15.6
19
14
16
13
June
22.8
25
20
24
23
July
25.1
22
24
27
26
August
24.5
23
24
24
24
September
18.7
21
19
20
17
October
9.9
11
13
14
6
November
0.5
2
1
2
2
December
-7.3
-1
-7
-8
-5
Average
6.1
-5.3
9.4
7.0
9.3
8.0
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
-18.6
-14
-15
-23
-15
-16
February
-19.3
-11
-18
-24
-22
-17
March
-11.8
-12
-15
-12
-6
-10
April
-4.9
-3
-4
-1
-4
May
6.7
9
6
6
6
June
14.7
17
13
15
14
July
18.1
17
18
19
19
August
17.0
17
18
17
17
September
11.8
14
12
14
10
October
4.4
6
7
8
1
November
-6.9
-3
-5
-3
-6
December
-14.2
-7
-13
-16
-13
Average
-2.3
-13.6
2.4
-1.6
1.3
0.2
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
9.6
10
8
10
9
10
February
9.9
9
10
11
10
10
March
10.7
12
10
10
11
11
April
9.7
10
11
9
11
May
9.8
10
12
10
10
June
10.0
8
11
10
12
July
10.2
10
11
10
11
August
10.1
10
10
12
10
September
11.7
10
12
13
13
October
12.0
10
13
11
13
November
11.8
14
11
12
12
December
9.4
10
11
9
9
Average
10.3
10.1
9.8
11.0
10.4
10.9
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
256°
253°
274°
229°
224°
February
286°
233°
306°
258°
252°
March
298°
245°
289°
211°
240°
April
033°
359°
320°
302°
May
119°
240°
274°
284°
June
095°
295°
275°
176°
July
299°
300°
240°
237°
August
268°
257°
271°
276°
September
141°
252°
258°
288°
October
341°
274°
303°
278°
November
261°
194°
268°
235°
December
213°
040°
251°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.