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
2022
2021
2020
January
95.1
96
93
94
96
92
February
95.6
98
95
96
92
97
March
92.0
95
86
78
96
98
April
88.8
83
88
89
90
May
86.7
79
87
83
93
June
80.2
83
79
77
83
July
66.9
65
65
62
65
August
70.8
69
76
62
66
September
80.8
80
84
80
63
October
87.7
89
64
97
85
November
94.5
98
98
93
96
December
94.2
95
86
92
95
Average
86.7
96.3
83.4
81.8
84.0
84.6
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
2024
2023
2022
2021
2020
January
16.1
15
15
18
17
16
February
15.9
15
14
19
16
17
March
16.3
16
14
17
17
17
April
17.0
15
18
17
17
May
17.8
16
19
18
21
June
19.7
17
22
21
21
July
20.0
19
20
21
21
August
21.7
22
22
22
25
September
21.7
20
22
22
21
October
21.1
22
18
21
22
November
18.5
19
16
21
18
December
16.1
17
13
15
16
Average
18.2
15.5
17.3
18.9
18.9
19.3
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
7.4
8
7
7
7
8
February
6.9
8
5
7
7
7
March
8.4
9
7
9
8
10
April
9.6
8
10
10
11
May
10.8
10
10
11
12
June
11.9
11
12
13
11
July
12.8
12
14
14
11
August
14.5
14
14
15
17
September
12.5
13
14
14
5
October
11.1
12
11
12
10
November
8.6
9
6
10
7
December
7.3
8
5
8
6
Average
9.9
8.0
9.6
10.0
10.8
9.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.1
4
17
1
7
2
February
6.7
12
13
0
2
0
March
8.3
6
19
4
5
9
April
2.8
1
5
1
3
May
1.0
2
0
0
1
June
0.1
1
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.3
1
1
0
0
October
0.6
1
0
4
0
November
3.0
2
3
3
1
December
6.5
7
18
10
1
Average
3.3
7.3
4.8
2.1
2.3
1.4
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
2024
2023
2022
2021
2020
January
4.8
4
6
4
5
4
February
6.1
6
7
5
6
6
March
6.3
7
7
6
6
6
April
6.7
7
7
7
6
May
7.0
7
7
7
6
June
6.7
7
6
7
7
July
6.7
6
7
7
7
August
6.0
6
6
6
6
September
5.6
6
5
6
5
October
5.1
5
5
6
4
November
4.6
5
5
4
5
December
4.5
4
5
5
5
Average
5.9
5.6
6.0
5.8
6.1
5.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
263°
236°
326°
308°
306°
February
247°
270°
304°
311°
314°
March
279°
259°
307°
296°
260°
April
304°
288°
290°
291°
May
278°
300°
291°
299°
June
284°
306°
290°
290°
July
302°
299°
290°
286°
August
290°
299°
286°
299°
September
288°
307°
281°
315°
October
299°
297°
280°
327°
November
303°
296°
299°
315°
December
288°
218°
257°
318°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.