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
60.4
60
February
96.8
97
March
89.4
89
April
89.2
89
May
June
July
August
September
92.1
92
October
91.7
92
November
90.9
91
December
75.8
76
Average
86.1
84.8
87.3
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
1.3
1
February
10.7
11
March
14.7
15
April
18.2
18
May
June
July
August
September
25.1
25
October
18.7
19
November
12.4
12
December
8.3
8
Average
12.9
11.2
14.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
January
-5.1
-5
February
-2.8
-1
March
3.8
4
April
8.3
8
May
June
July
August
September
14.6
15
October
8.5
9
November
1.6
2
December
0.8
1
Average
3.2
1.5
4.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
January
11.4
12
February
3.5
4
March
4.4
5
April
8.9
9
May
June
July
August
September
3.1
3
October
5.3
5
November
5.0
5
December
6.8
7
Average
6.2
7.0
5.3
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
8.3
8
February
8.7
9
March
10.4
10
April
10.1
10
May
June
July
August
September
3.7
4
October
8.0
8
November
8.1
8
December
7.5
8
Average
8.4
9.5
7.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
January
250°
February
254°
March
237°
April
250°
May
June
July
August
September
106°
October
253°
November
240°
December
224°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.