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
76.2
71
87
72
73
69
February
93.9
91
85
96
97
95
March
97.1
98
97
98
96
97
April
98.6
98
99
99
100
98
May
99.0
99
100
100
100
June
99.5
99
99
100
100
July
99.9
100
100
100
100
August
95.8
99
99
96
84
September
94.6
99
97
98
69
October
94.4
99
99
85
85
November
84.8
94
86
63
93
December
75.9
84
63
72
71
Average
92.7
89.6
95.4
93.5
90.7
88.9
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
15.6
16
14
16
20
14
February
17.8
17
17
20
18
20
March
19.9
20
16
23
20
19
April
24.5
24
20
24
27
24
May
29.5
28
30
31
31
June
34.3
31
36
36
34
July
37.3
38
37
38
37
August
36.9
37
38
37
37
September
33.5
32
35
35
34
October
27.3
28
29
25
29
November
19.8
22
17
19
19
December
14.8
18
12
13
14
Average
25.2
19.2
25.8
26.7
26.4
25.9
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
5.1
6
5
2
5
4
February
4.5
7
3
2
4
3
March
6.8
7
7
6
5
6
April
8.9
9
8
8
8
10
May
12.0
12
11
11
12
June
15.2
14
16
16
15
July
17.8
17
18
19
16
August
17.2
17
18
17
18
September
15.1
15
17
15
15
October
9.9
11
11
10
11
November
5.4
5
3
7
4
December
4.2
5
4
5
3
Average
9.8
7.0
10.3
9.7
10.0
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.3
7
14
0
8
4
February
4.3
7
1
0
1
0
March
6.3
5
17
3
3
8
April
3.0
4
0
4
0
2
May
2.0
0
0
0
1
June
0.5
0
0
0
0
July
0.0
0
0
0
0
August
0.1
0
0
0
0
September
0.6
2
3
0
0
October
0.5
1
0
2
0
November
3.9
2
7
0
1
December
6.2
4
8
11
3
Average
3.1
5.8
3.3
1.8
1.9
1.5
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
4.6
5
7
2
5
4
February
5.1
5
4
3
5
3
March
5.5
6
8
5
5
5
April
6.6
6
7
7
6
7
May
6.8
6
8
7
7
June
6.6
6
7
6
7
July
6.0
6
7
5
6
August
5.4
5
6
5
5
September
5.0
5
5
5
5
October
4.6
4
5
5
4
November
3.8
4
4
3
4
December
4.3
4
5
5
5
Average
5.4
5.4
5.4
5.5
5.3
5.2
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
113°
133°
202°
129°
283°
February
150°
115°
343°
313°
310°
March
276°
140°
299°
304°
236°
April
304°
308°
304°
296°
300°
May
299°
304°
304°
299°
June
301°
298°
298°
297°
July
296°
298°
298°
297°
August
292°
302°
300°
297°
September
304°
300°
302°
299°
October
297°
301°
292°
289°
November
301°
329°
295°
312°
December
114°
133°
148°
211°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.