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
February
0.0
0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
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
0.0
0
2
0
-2
February
-1.1
0
-2
0
-1
March
0.9
3
0
1
0
April
5.1
5
5
4
May
9.1
11
11
8
June
13.2
16
17
July
17.7
23
22
20
13
August
16.0
20
23
24
0
September
13.7
20
19
20
0
October
11.9
15
18
14
10
November
7.2
6
9
9
9
December
2.7
4
5
3
7
Average
7.6
0.8
10.1
11.1
14.7
3.6
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
-6.0
-5
-3
-8
-7
February
-8.6
-4
-9
-7
-8
March
-4.2
-2
-4
-4
-5
April
-1.8
0
0
-1
May
3.3
4
5
1
June
8.4
10
11
July
12.6
17
16
15
7
August
11.8
16
18
17
0
September
9.7
14
13
14
0
October
6.6
9
9
9
5
November
1.7
1
3
3
3
December
-3.7
-1
1
-3
3
Average
2.5
-4.4
4.6
4.9
8.9
-1.2
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
February
0.0
0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
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
13.7
14
14
15
11
February
13.9
14
14
16
12
March
13.2
12
12
13
15
April
12.0
10
13
12
May
11.5
12
12
12
June
9.5
11
11
July
7.5
9
10
9
6
August
9.7
10
9
10
11
September
11.6
10
13
11
12
October
11.9
11
10
11
13
November
14.4
13
15
13
13
December
12.9
15
16
14
12
Average
11.8
13.2
11.5
12.4
11.2
12.2
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
301°
337°
276°
314°
February
317°
298°
281°
254°
March
193°
338°
257°
313°
April
298°
301°
346°
May
282°
286°
291°
June
096°
161°
July
169°
211°
198°
185°
August
190°
163°
202°
249°
September
303°
296°
206°
220°
October
274°
223°
323°
263°
November
268°
274°
254°
240°
December
306°
027°
278°
169°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.