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
89.1
89
82
94
88
89
February
81.5
83
85
85
67
80
March
88.2
85
90
83
90
85
April
92.4
94
83
95
96
95
May
92.1
88
87
97
96
June
92.5
91
96
89
94
July
93.2
92
95
93
93
August
93.4
96
92
96
93
September
93.3
93
91
91
92
October
92.5
93
95
97
93
November
86.1
80
78
96
90
December
80.4
90
69
72
89
Average
89.8
87.9
88.5
88.9
90.1
91.0
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
16.8
17
19
16
15
18
February
20.6
20
22
19
18
19
March
23.1
23
23
24
24
25
April
25.7
26
26
26
24
26
May
29.4
28
30
28
29
June
31.6
31
34
31
32
July
32.4
33
32
31
33
August
32.5
35
32
32
33
September
30.8
31
30
29
29
October
26.7
26
26
26
27
November
20.9
20
21
20
24
December
18.0
17
20
21
17
Average
25.2
21.5
25.9
25.9
25.0
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
5.0
4
7
2
6
6
February
8.8
7
11
6
8
8
March
10.7
11
11
10
12
15
April
12.6
14
14
12
11
13
May
17.3
17
18
16
16
June
20.5
21
22
21
21
July
22.3
23
22
22
23
August
22.3
23
22
22
23
September
19.9
19
18
20
20
October
14.5
13
11
15
16
November
8.5
8
10
6
12
December
7.2
6
10
11
4
Average
13.6
8.9
14.2
13.7
14.2
14.6
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
10
14
11
7
7
February
7.9
12
8
9
8
11
March
5.7
6
6
9
7
4
April
4.2
3
10
3
4
2
May
4.0
4
6
1
2
June
5.7
5
4
7
6
July
4.7
6
6
6
3
August
4.8
4
7
4
4
September
4.2
1
5
3
9
October
4.4
3
3
3
3
November
5.0
8
6
2
3
December
7.8
10
5
5
5
Average
5.6
7.4
6.5
6.1
4.6
4.9
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
6.5
7
6
7
6
6
February
7.0
8
8
7
6
7
March
7.1
6
7
7
7
7
April
6.6
7
7
7
6
7
May
5.5
6
6
6
5
June
5.2
6
5
5
5
July
4.1
4
4
4
4
August
4.5
5
4
5
5
September
5.2
5
5
4
7
October
6.0
6
5
5
6
November
5.9
6
7
5
7
December
5.9
7
4
6
6
Average
5.9
6.9
6.1
5.6
5.3
5.9
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
305°
239°
301°
290°
030°
February
317°
225°
276°
347°
234°
March
018°
218°
241°
159°
204°
April
228°
097°
188°
266°
287°
May
023°
186°
124°
185°
June
244°
343°
166°
160°
July
263°
215°
206°
234°
August
306°
170°
094°
197°
September
043°
024°
067°
056°
October
018°
017°
020°
048°
November
025°
010°
006°
028°
December
024°
038°
199°
325°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.