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
January
77.4
84
76
67
85
February
85.3
86
88
84
83
March
80.5
84
70
85
86
April
73.9
60
80
83
May
71.0
86
26
88
93
June
88.5
82
83
95
93
July
97.7
95
99
99
August
98.7
97
100
99
September
96.2
92
100
97
October
96.6
97
98
95
November
83.7
96
83
78
December
82.4
69
89
90
Average
85.3
84.3
77.7
88.9
90.3
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
January
22.5
21.1
22.8
24.6
21.5
February
23.5
23.6
25.3
24.0
21.3
March
26.5
27.3
27.5
26.6
24.6
April
28.5
29.3
27.6
28.5
May
31.3
30.5
33.5
30.5
30.8
June
31.2
29.3
32.5
32.3
30.6
July
31.5
30.6
32.5
31.6
August
32.1
31.5
32.5
32.3
September
31.3
31.1
33.1
29.8
October
28.7
29.0
29.3
27.8
November
25.7
27.8
24.8
24.6
December
24.7
25.1
23.5
26.0
Average
27.8
26.4
28.8
28.5
27.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
January
16.2
14.9
16.1
19.0
15.0
February
17.2
17.8
18.6
17.6
14.8
March
20.5
20.8
22.1
21.1
18.1
April
23.0
23.1
22.6
23.1
May
25.6
25.6
27.5
23.6
25.6
June
25.7
25.5
26.5
27.0
23.8
July
26.0
25.8
26.5
25.6
August
26.4
26.1
26.6
26.6
September
25.7
25.8
27.0
24.3
October
23.4
23.3
24.1
23.0
November
20.4
22.3
19.1
20.0
December
19.2
19.6
18.3
20.1
Average
22.1
20.9
23.1
22.7
21.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
January
5.5
6
9
3
5
February
2.0
1
3
0
4
March
1.0
0
2
2
1
April
4.2
6
3
4
May
0.4
2
0
1
0
June
9.2
23
11
0
6
July
2.6
5
1
2
August
1.2
3
1
1
September
5.3
4
0
11
October
4.9
5
2
8
November
7.9
1
8
12
December
6.4
4
11
1
Average
4.5
6.3
4.3
2.6
4.8
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
January
4.2
7
2
3
5
February
4.6
7
3
3
6
March
5.0
8
4
3
6
April
4.6
3
4
8
May
4.7
8
3
1
9
June
5.3
6
7
3
5
July
4.5
5
3
6
August
4.7
5
3
6
September
4.2
5
3
4
October
4.3
6
3
4
November
2.2
6
1
1
December
3.4
6
2
2
Average
4.8
7.1
4.3
2.7
5.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
January
001°
020°
069°
338°
February
056°
060°
041°
024°
March
097°
074°
085°
062°
April
088°
067°
094°
May
098°
088°
099°
098°
June
118°
068°
102°
083°
July
098°
088°
107°
August
080°
088°
105°
September
023°
084°
022°
October
356°
049°
012°
November
089°
093°
281°
December
036°
008°
123°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.