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
86.1
86
February
95.5
96
March
70.9
71
April
May
85.9
86
June
86.2
86
July
93.4
94
August
91.3
91
September
96.6
97
October
73.3
73
November
93.0
93
December
86.4
87
Average
86.0
83.6
88.5
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
13.0
13
February
17.0
17
March
20.3
20
April
May
22.7
23
June
28.1
28
July
31.6
32
August
31.7
32
September
27.8
28
October
23.4
24
November
17.8
18
December
15.5
16
Average
20.8
16.8
24.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
January
1.8
2
February
5.3
5
March
8.3
8
April
May
16.2
16
June
17.1
17
July
20.5
21
August
20.5
21
September
16.3
16
October
11.8
12
November
6.2
6
December
4.9
5
Average
9.7
5.1
14.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
January
9.1
9
February
6.6
7
March
10.2
10
April
May
9.0
9
June
4.3
4
July
2.5
3
August
2.8
3
September
1.6
2
October
0.2
0
November
8.2
8
December
9.3
9
Average
6.5
8.7
4.3
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
6.6
7
February
6.0
6
March
6.2
6
April
May
0.3
0
June
0.3
0
July
0.0
0
August
0.2
0
September
0.1
0
October
0.1
0
November
0.2
0
December
5.5
6
Average
3.5
6.3
0.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
January
287°
February
284°
March
312°
April
May
272°
June
191°
July
194°
August
276°
September
161°
October
244°
November
255°
December
308°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.