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
94.2
93
98
93
97
96
February
97.4
95
100
96
99
97
March
98.3
99
97
97
100
100
April
98.9
99
100
100
99
May
99.2
98
100
99
99
June
99.4
100
99
100
100
July
97.6
98
98
95
98
August
95.9
100
96
96
94
September
95.5
99
99
99
80
October
95.7
97
90
100
95
November
92.4
100
98
94
94
December
94.0
94
87
88
98
Average
96.6
95.7
98.2
96.5
97.3
95.7
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
16.0
17
16
17
17
15
February
17.3
18
15
20
18
19
March
18.3
19
15
21
18
17
April
21.1
20
22
21
21
May
23.1
21
25
23
26
June
26.3
23
28
25
28
July
27.2
28
26
26
27
August
28.3
30
28
27
29
September
27.7
26
29
28
29
October
25.2
27
24
24
28
November
19.9
22
18
20
19
December
15.9
18
14
14
17
Average
21.7
17.7
21.7
22.7
21.7
22.9
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
7.3
9
8
6
7
7
February
6.6
9
5
5
7
5
March
8.3
10
7
8
7
9
April
9.9
9
10
8
10
May
12.1
12
11
11
13
June
14.3
13
15
14
15
July
15.0
15
15
15
15
August
16.3
17
16
15
17
September
15.3
15
17
14
16
October
12.6
14
13
12
14
November
8.6
10
7
10
7
December
6.9
9
6
7
6
Average
10.8
9.0
11.1
10.8
10.6
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.3
9
15
0
7
4
February
7.6
18
9
0
4
0
March
8.5
8
17
3
4
9
April
2.4
1
3
0
5
May
1.3
1
0
0
1
June
0.3
0
0
0
1
July
0.0
0
0
0
0
August
0.2
2
0
0
0
September
0.3
0
1
0
0
October
0.7
2
0
4
0
November
3.3
1
4
1
1
December
8.0
9
21
12
3
Average
4.1
11.2
4.3
2.0
2.3
2.0
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
5.6
6
8
3
6
5
February
6.6
7
7
5
7
6
March
6.9
7
8
7
7
6
April
6.9
7
8
7
6
May
7.3
7
9
7
7
June
7.2
7
8
7
8
July
6.6
6
7
6
7
August
6.3
6
7
6
6
September
6.1
6
7
6
5
October
5.5
5
5
6
5
November
4.8
5
5
5
5
December
5.2
5
5
6
5
Average
6.3
6.5
6.4
6.2
6.4
6.0
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
170°
170°
326°
334°
324°
February
159°
299°
328°
320°
328°
March
287°
176°
325°
322°
277°
April
323°
329°
324°
326°
May
290°
333°
328°
306°
June
304°
336°
324°
329°
July
324°
325°
322°
323°
August
316°
324°
318°
327°
September
322°
318°
322°
330°
October
322°
324°
304°
325°
November
313°
316°
321°
308°
December
154°
167°
171°
317°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.