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
January
81.1
81
February
91.3
91
March
94.7
95
April
May
June
July
August
September
October
94.4
94
November
97.1
97
December
88.7
89
Average
91.7
89.2
94.3
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
January
2.3
2
February
12.7
13
March
12.4
12
April
May
June
July
August
September
October
19.6
20
November
14.2
14
December
8.5
9
Average
11.5
8.8
14.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
January
-4.8
-3
February
3.9
4
March
3.1
3
April
May
June
July
August
September
October
9.7
10
November
2.4
2
December
1.0
1
Average
2.6
1.1
4.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
January
16.8
17
February
2.1
2
March
5.2
5
April
May
June
July
August
September
October
4.7
5
November
0.4
1
December
13.0
13
Average
6.4
8.1
4.7
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
January
10.3
10
February
11.7
12
March
11.1
11
April
May
June
July
August
September
October
7.7
8
November
10.3
10
December
11.0
11
Average
10.4
11.0
9.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
January
339°
February
195°
March
325°
April
May
June
July
August
September
October
154°
November
320°
December
307°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.