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
0
July
0.0
0
0
0
August
0.0
0
0
September
0.0
0
0
October
0.0
0
0
0
November
0.0
0
0
0
December
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
5.6
6
0
6
5
February
5.1
7
0
7
7
March
6.1
8
0
7
7
April
7.3
0
8
9
May
8.9
0
10
11
June
10.4
0
12
13
July
14.2
11
15
14
August
13.6
17
5
September
11.9
15
0
October
9.6
12
0
10
November
7.6
10
0
8
December
6.3
8
0
4
Average
8.3
7.2
6.0
5.9
6.6
9.0
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
3.4
4
0
3
2
February
2.6
4
0
4
4
March
3.1
4
0
5
3
April
4.3
0
4
5
May
5.9
0
6
8
June
7.5
0
8
9
July
10.5
8
11
11
August
10.6
13
4
September
9.1
11
0
October
7.1
9
0
7
November
5.4
7
0
6
December
3.9
5
0
1
Average
5.5
4.0
4.3
3.8
3.7
5.6
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
0
July
0.0
0
0
0
August
0.0
0
0
September
0.0
0
0
October
0.0
0
0
0
November
0.0
0
0
0
December
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
15.6
17
0
17
19
February
13.9
15
0
18
16
March
12.0
14
0
16
11
April
12.7
0
15
13
May
11.6
0
13
16
June
10.6
0
13
14
July
10.5
7
13
12
August
11.0
9
4
September
9.9
15
0
October
11.9
14
0
16
November
15.2
17
0
23
December
16.0
22
0
18
Average
13.5
14.9
6.1
9.6
20.1
14.2
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
135°
360°
190°
194°
February
341°
360°
252°
252°
March
223°
360°
221°
243°
April
360°
191°
223°
May
360°
254°
151°
June
360°
257°
248°
July
280°
279°
241°
August
274°
302°
September
220°
360°
October
153°
360°
213°
November
212°
360°
212°
December
190°
360°
290°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.