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
84.7
89
84
85
83
91
February
83.9
87
85
85
68
92
March
85.2
66
86
87
87
88
April
91.2
87
93
99
93
May
87.9
83
84
97
82
June
95.2
84
98
95
96
July
96.3
96
92
98
98
August
96.4
93
96
95
99
September
94.8
89
94
99
93
October
93.5
98
84
93
90
November
91.1
90
89
95
90
December
90.7
88
87
91
95
Average
90.0
79.3
88.4
89.9
92.3
92.3
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
2024
2023
2022
2021
2020
January
12.9
13
15
12
11
16
February
15.3
12
16
15
11
15
March
16.5
17
16
19
17
18
April
21.2
21
21
20
21
May
24.5
22
24
24
24
June
28.1
26
29
28
28
July
29.8
28
30
30
32
August
29.9
30
29
30
31
September
26.4
28
28
28
27
October
24.1
23
21
24
24
November
18.9
17
20
18
21
December
15.4
15
14
18
15
Average
21.0
14.0
21.4
22.0
21.8
22.6
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
5.6
6
7
4
5
9
February
8.0
6
9
7
6
9
March
9.2
10
9
12
9
12
April
14.0
15
14
12
13
May
18.2
16
19
17
18
June
22.2
20
23
23
22
July
24.3
22
25
24
26
August
24.3
25
24
25
25
September
20.9
22
21
22
22
October
17.1
17
15
19
18
November
11.1
11
13
10
14
December
8.0
8
9
8
6
Average
14.3
7.3
14.8
15.6
14.9
16.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
5
8
11
12
6
February
9.5
7
13
12
15
10
March
8.6
19
7
8
5
10
April
5.6
13
6
1
6
May
8.4
15
12
5
11
June
5.5
7
2
7
9
July
5.2
5
8
4
4
August
6.6
9
10
6
2
September
7.2
11
7
6
10
October
6.4
5
6
9
10
November
8.5
13
11
5
5
December
10.8
11
11
9
8
Average
7.7
11.1
9.6
8.2
6.6
7.4
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
7.6
8
6
9
7
8
February
7.0
1
8
8
8
8
March
8.4
9
8
9
8
8
April
8.8
8
8
8
10
May
8.1
8
8
8
8
June
7.5
8
7
8
8
July
7.8
6
8
8
8
August
6.9
7
7
6
7
September
7.6
8
7
7
7
October
7.2
7
7
7
7
November
7.5
7
8
7
8
December
7.4
7
7
7
8
Average
7.5
6.0
7.5
7.8
7.3
7.8
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
242°
274°
316°
304°
294°
February
233°
275°
312°
337°
280°
March
178°
300°
232°
060°
278°
April
171°
225°
254°
238°
May
044°
225°
289°
162°
June
200°
155°
204°
213°
July
211°
223°
215°
212°
August
208°
212°
209°
210°
September
054°
084°
159°
052°
October
321°
352°
300°
033°
November
020°
115°
342°
175°
December
144°
027°
282°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.