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
82.6
72
83
68
86
79
February
79.4
80
79
71
82
78
March
87.1
84
88
73
95
86
April
89.5
86
97
93
87
May
86.7
87
83
85
93
June
87.5
83
75
91
91
July
85.4
87
81
77
85
August
82.4
81
82
75
92
September
83.2
81
82
86
58
October
78.7
77
62
87
72
November
82.4
74
83
77
90
December
80.1
62
88
78
85
Average
83.7
78.7
81.1
78.6
84.4
83.1
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
9.8
10
10
10
10
10
February
9.1
11
9
10
8
10
March
11.2
13
11
11
10
10
April
13.3
13
12
15
14
May
16.2
19
14
15
17
June
18.6
18
19
20
18
July
20.2
22
21
19
20
August
21.5
24
23
20
21
September
20.3
20
21
20
22
October
16.4
18
18
15
16
November
11.8
11
11
12
11
December
9.4
12
7
8
11
Average
14.4
11.3
15.4
15.2
14.4
14.7
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
4.2
5
4
3
4
6
February
3.1
5
3
4
4
3
March
3.6
5
3
5
3
3
April
5.9
6
5
5
5
May
9.2
10
8
9
10
June
11.1
11
12
12
11
July
12.1
13
13
13
12
August
12.8
13
14
13
11
September
11.4
11
12
11
13
October
7.9
9
9
8
8
November
5.0
3
3
7
5
December
4.0
6
2
3
5
Average
7.2
5.0
7.5
7.6
7.6
7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
27.6
45
27
24
28
39
February
29.0
41
23
24
33
21
March
24.3
32
29
29
19
14
April
21.2
33
22
7
9
May
11.9
6
24
6
15
June
10.5
8
18
12
9
July
3.9
5
1
4
7
August
4.0
8
2
5
4
September
8.4
15
3
9
8
October
16.3
21
13
20
11
November
24.9
16
27
36
21
December
25.4
30
18
30
23
Average
18.9
39.3
17.8
16.7
15.9
14.2
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
7.4
6
7
7
6
11
February
7.7
6
8
8
9
7
March
7.4
6
8
7
8
8
April
8.0
8
8
8
7
May
7.4
7
8
8
8
June
7.5
8
7
7
8
July
6.9
6
7
8
7
August
7.0
7
7
7
8
September
6.8
6
7
7
7
October
6.8
6
6
8
7
November
7.2
5
7
9
8
December
6.9
6
5
8
8
Average
7.1
5.8
6.9
6.8
7.7
7.6
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
204°
142°
157°
144°
201°
February
148°
255°
195°
256°
259°
March
204°
201°
239°
252°
233°
April
213°
227°
287°
272°
May
304°
249°
282°
272°
June
294°
263°
267°
271°
July
292°
294°
307°
295°
August
278°
275°
284°
304°
September
253°
286°
281°
246°
October
196°
251°
207°
269°
November
081°
135°
188°
207°
December
135°
098°
189°
145°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.