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
81.3
64
92
82
77
71
February
84.0
83
85
86
85
84
March
82.2
78
76
77
90
85
April
77.7
83
74
80
80
72
May
69.7
58
68
77
70
June
68.3
56
60
58
85
July
57.1
52
41
44
70
August
61.8
61
44
80
72
September
71.5
65
68
77
64
October
77.8
78
62
72
83
November
80.4
80
85
79
84
December
82.2
68
92
79
77
Average
74.6
79.9
68.9
67.8
74.1
76.2
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
12.4
17
13
14
12
11
February
12.1
12
11
15
11
13
March
12.5
13
10
14
13
13
April
14.6
16
13
13
15
16
May
16.7
16
16
18
17
June
20.0
19
20
19
21
July
19.9
20
19
19
21
August
21.2
22
20
22
23
September
21.3
21
21
21
22
October
18.4
19
17
16
21
November
14.0
15
13
15
13
December
11.9
14
9
10
13
Average
15.9
13.7
16.1
15.9
15.8
16.9
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
5.9
11
6
5
7
7
February
4.8
6
3
6
4
5
March
5.1
6
3
6
5
5
April
6.9
7
6
6
6
8
May
8.7
9
8
9
9
June
11.0
10
11
11
11
July
11.5
12
12
11
11
August
12.6
13
13
12
13
September
12.2
12
12
11
14
October
10.2
11
10
9
12
November
7.0
8
5
8
6
December
5.6
8
3
5
6
Average
8.2
6.8
8.3
8.0
8.2
8.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
30.5
56
35
17
32
32
February
25.5
32
28
17
24
10
March
27.1
33
43
17
18
24
April
19.7
11
29
19
6
16
May
13.6
12
27
8
18
June
9.9
7
21
16
5
July
9.0
11
11
12
9
August
8.5
5
12
4
9
September
9.0
14
9
12
7
October
11.7
12
13
20
7
November
19.0
22
25
18
13
December
26.5
35
25
39
24
Average
17.9
26.7
19.7
17.3
16.6
13.9
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
5.3
5
6
4
6
6
February
5.3
6
5
5
5
4
March
5.5
6
6
5
6
5
April
5.6
5
5
6
5
5
May
5.6
5
7
6
5
June
5.2
4
5
5
5
July
3.9
4
3
3
5
August
3.8
4
3
5
4
September
4.5
5
4
4
4
October
4.3
4
3
5
4
November
4.2
4
4
4
4
December
4.1
5
5
4
4
Average
4.9
5.6
4.6
4.5
5.0
4.6
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
136°
148°
174°
144°
154°
February
153°
264°
303°
294°
296°
March
176°
155°
290°
231°
251°
April
293°
197°
265°
291°
269°
May
252°
281°
304°
251°
June
260°
249°
198°
269°
July
209°
199°
180°
278°
August
226°
201°
287°
231°
September
217°
199°
186°
153°
October
188°
231°
180°
329°
November
151°
179°
161°
180°
December
146°
156°
156°
147°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.