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
95.8
93
93
91
98
96
February
96.7
94
96
95
100
98
March
97.4
98
98
98
99
96
April
97.9
94
97
99
100
May
96.2
87
96
95
100
June
98.5
99
97
99
99
July
97.2
95
96
95
97
August
98.0
92
100
99
99
September
98.2
98
99
97
100
October
97.8
95
100
99
99
November
97.0
95
91
97
98
December
95.3
96
91
94
91
Average
97.2
95.2
94.7
95.6
97.5
97.6
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
25.0
25.6
24.8
25.5
25.0
25.3
February
24.5
26.1
24.0
24.5
25.6
24.3
March
25.0
26.1
24.5
25.5
26.6
23.6
April
25.5
25.3
25.8
25.8
22.8
May
26.6
26.3
26.1
26.6
26.8
June
27.9
27.3
27.6
27.8
27.8
July
28.1
27.8
27.8
27.3
27.3
August
28.7
28.3
28.6
29.0
28.1
September
28.8
28.8
28.6
29.0
27.6
October
28.0
28.3
28.8
28.1
27.0
November
26.6
26.1
26.6
26.6
27.1
December
25.3
26.8
24.8
25.6
24.6
Average
26.6
25.9
26.5
26.7
27.0
26.0
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
17.1
17.1
18.1
17.1
16.5
17.3
February
17.0
17.3
17.3
18.5
16.1
16.8
March
16.9
18.5
16.8
15.5
17.1
14.1
April
17.5
18.1
18.5
18.0
12.0
May
17.9
19.3
13.6
16.6
18.1
June
18.9
20.8
11.4
19.1
19.0
July
20.8
20.8
20.6
20.8
20.8
August
20.7
20.6
20.0
20.5
19.6
September
20.3
20.0
19.8
18.3
20.1
October
20.2
20.5
19.3
20.5
19.8
November
19.3
19.8
19.1
18.8
18.8
December
18.2
18.6
18.5
18.0
18.1
Average
18.6
17.7
19.2
17.6
18.4
17.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
13.2
15
21
15
9
17
February
15.9
7
19
31
3
14
March
13.8
13
18
21
8
19
April
10.7
21
19
12
2
May
10.8
28
13
9
7
June
6.7
11
12
4
3
July
10.0
15
16
14
8
August
6.5
16
6
7
3
September
6.8
8
11
8
4
October
7.8
15
3
8
10
November
10.6
16
20
13
5
December
11.6
7
26
11
15
Average
10.0
11.8
16.4
16.4
9.0
8.4
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
5.8
6
7
5
4
6
February
6.3
5
7
7
5
7
March
6.0
6
7
5
5
7
April
6.6
8
6
8
7
May
6.3
7
6
7
7
June
6.5
7
6
7
6
July
6.9
6
6
7
7
August
7.1
6
8
6
8
September
6.4
6
7
6
7
October
5.7
6
5
6
7
November
6.0
6
6
7
5
December
6.1
5
6
7
6
Average
6.3
5.6
6.5
6.1
6.3
6.7
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
062°
206°
359°
074°
066°
February
081°
066°
078°
059°
079°
March
081°
065°
167°
059°
070°
April
091°
074°
076°
046°
May
093°
085°
097°
080°
June
073°
074°
073°
080°
July
073°
073°
070°
073°
August
071°
078°
076°
071°
September
082°
076°
076°
071°
October
075°
065°
054°
068°
November
064°
084°
049°
073°
December
078°
032°
089°
082°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.