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
81.0
74
88
69
85
85
February
79.4
84
82
72
78
79
March
86.6
91
94
74
96
89
April
88.4
86
85
95
95
91
May
87.4
88
89
83
96
June
86.6
82
79
89
92
July
80.1
82
81
70
81
August
76.3
77
80
72
85
September
79.7
84
79
81
63
October
80.1
81
70
92
77
November
80.3
91
64
71
86
December
79.6
72
90
76
84
Average
82.6
84.0
83.9
78.4
82.3
84.2
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
9.1
8
10
10
9
9
February
8.6
10
9
10
7
9
March
11.0
12
11
11
10
10
April
13.2
13
13
12
14
13
May
16.2
18
14
15
17
June
18.6
18
19
21
17
July
20.3
21
21
20
20
August
21.7
24
23
21
21
September
20.2
20
22
20
22
October
15.9
16
19
15
15
November
11.2
11
11
12
11
December
8.6
10
7
7
10
Average
14.1
10.7
15.0
15.2
14.3
14.3
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
4.4
4
6
4
5
6
February
3.2
5
4
5
4
4
March
4.2
4
4
7
3
3
April
6.0
4
7
5
5
6
May
9.4
11
8
8
10
June
11.6
11
12
13
11
July
13.0
13
14
14
12
August
13.9
15
15
14
13
September
12.3
11
14
12
13
October
8.5
8
11
9
9
November
5.4
4
4
8
5
December
4.2
6
3
3
5
Average
7.6
4.1
8.2
8.6
8.1
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.4
34
21
23
27
35
February
23.6
31
24
19
32
17
March
18.7
23
22
20
16
13
April
17.9
20
26
18
5
6
May
9.3
3
21
6
13
June
8.0
4
16
10
7
July
2.2
3
3
1
3
August
2.1
4
0
3
4
September
5.8
8
3
11
3
October
13.1
15
13
17
10
November
20.3
14
18
33
28
December
20.9
22
19
22
20
Average
14.5
26.4
13.1
13.9
13.8
12.0
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
9.9
10
9
10
9
13
February
9.2
9
10
9
10
9
March
8.9
8
9
8
10
8
April
9.2
9
9
10
8
8
May
8.3
8
9
9
9
June
8.4
9
8
8
9
July
7.7
8
7
8
8
August
7.5
8
7
8
8
September
7.3
7
7
8
8
October
7.9
7
7
10
8
November
9.1
8
9
11
9
December
8.7
8
7
9
10
Average
8.6
9.1
8.4
8.1
8.8
8.7
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
115°
121°
124°
119°
201°
February
145°
234°
188°
265°
250°
March
152°
143°
215°
223°
218°
April
235°
197°
224°
255°
249°
May
269°
251°
258°
256°
June
265°
247°
257°
256°
July
255°
263°
267°
262°
August
257°
253°
262°
264°
September
240°
242°
236°
184°
October
137°
220°
187°
250°
November
114°
115°
173°
171°
December
106°
093°
107°
121°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.