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
2025
2024
2023
2022
2021
January
95.9
94
93
97
96
97
February
97.2
96
98
96
98
97
March
98.4
99
99
98
98
99
April
98.6
99
97
100
99
May
98.8
99
95
98
100
100
June
98.4
97
98
98
99
100
July
97.4
93
98
98
97
August
97.0
92
97
98
99
September
98.1
97
98
100
96
October
97.8
97
99
99
99
November
97.4
99
95
99
98
December
96.2
96
95
97
98
Average
97.6
96.8
96.1
97.2
98.4
98.3
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
2025
2024
2023
2022
2021
January
29.1
28.5
30.1
30.1
28.8
28.5
February
31.1
30.3
30.5
30.6
30.0
31.3
March
33.8
34.0
36.1
34.3
32.2
33.5
April
36.1
36.7
36.1
34.6
35.6
May
36.6
38.0
40.1
36.3
36.0
35.6
June
34.1
34.0
35.2
37.6
32.7
34.2
July
33.3
32.7
33.6
32.7
33.5
August
33.5
33.3
33.6
32.7
33.5
September
33.2
34.0
34.2
32.1
33.7
October
31.6
30.5
32.7
31.3
33.3
November
29.9
30.1
29.6
31.0
29.6
December
29.0
28.1
28.3
30.1
30.5
Average
32.7
33.0
33.1
33.1
32.1
32.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
16.4
10.0
13.0
16.5
18.6
19.1
February
16.4
9.6
12.5
16.1
19.1
17.8
March
18.4
17.5
16.8
18.0
18.5
18.8
April
20.9
19.5
21.0
21.3
21.1
May
22.4
21.1
24.6
19.8
22.8
21.8
June
19.8
12.3
16.3
19.8
21.0
18.6
July
18.6
6.7
15.6
21.6
20.6
August
20.4
12.1
19.3
22.5
22.8
September
20.5
15.5
16.1
22.8
21.6
October
20.0
12.5
19.3
22.6
21.8
November
18.3
15.6
10.8
21.5
19.6
December
17.0
14.5
13.1
20.1
19.3
Average
18.8
14.2
15.0
17.1
21.0
20.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.1
5
3
2
3
4
February
2.0
2
1
2
4
2
March
0.9
2
0
0
1
1
April
0.4
1
0
1
0
May
0.5
0
0
0
1
0
June
2.5
3
3
0
4
2
July
2.2
4
5
2
2
August
1.5
2
2
3
2
September
0.9
1
1
2
1
October
4.2
8
3
2
1
November
4.6
6
7
3
3
December
3.8
7
7
2
3
Average
2.2
2.4
3.0
2.3
2.2
1.6
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
2025
2024
2023
2022
2021
January
3.5
3
3
3
4
4
February
4.4
4
5
4
4
4
March
4.9
5
5
5
4
5
April
5.0
6
5
4
5
May
4.9
6
6
5
3
5
June
4.3
5
4
4
3
4
July
3.7
4
4
3
4
August
3.4
3
3
3
4
September
3.3
3
3
3
4
October
3.5
4
3
3
3
November
3.4
4
3
3
3
December
3.3
3
3
3
3
Average
4.0
4.6
4.1
3.8
3.3
4.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
013°
015°
059°
348°
011°
February
062°
008°
074°
013°
010°
March
060°
040°
065°
039°
056°
April
056°
043°
068°
049°
May
071°
067°
029°
068°
081°
June
087°
058°
071°
085°
084°
July
078°
096°
085°
085°
August
062°
047°
078°
072°
September
347°
054°
032°
069°
October
303°
010°
004°
022°
November
312°
327°
021°
322°
December
005°
340°
061°
064°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.