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
88.1
85
87
92
85
92
February
94.1
98
98
95
90
87
March
94.3
93
96
95
94
92
April
95.3
93
96
98
95
May
88.7
88
87
92
89
June
83.0
87
87
89
86
July
77.8
76
79
76
78
August
78.9
77
82
82
78
September
78.6
76
80
71
83
October
84.0
85
92
85
78
November
92.7
92
89
95
93
December
88.3
89
77
90
90
Average
87.1
92.0
87.3
88.1
88.5
86.4
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
10.3
10
12
10
10
11
February
14.4
16
16
14
12
12
March
17.4
19
17
18
18
18
April
20.1
21
21
21
20
May
24.4
24
26
23
23
June
27.3
27
29
28
27
July
29.1
29
30
29
29
August
27.1
28
28
24
29
September
25.2
26
26
17
26
October
20.6
22
21
12
23
November
16.8
18
17
16
19
December
12.9
13
11
16
11
Average
20.0
14.7
20.7
20.7
18.9
20.5
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
-2.6
-3
1
-3
-1
1
February
1.5
-1
4
0
0
1
March
3.8
4
3
3
4
7
April
4.9
7
5
4
6
May
11.6
11
13
10
10
June
15.5
14
16
16
16
July
18.4
18
19
18
19
August
15.1
17
18
9
19
September
13.6
14
13
11
15
October
7.6
8
4
5
10
November
1.4
1
3
-1
3
December
0.3
-1
3
2
-2
Average
7.6
-1.9
7.4
7.4
6.3
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.3
16
16
6
7
13
February
11.4
7
10
11
13
19
March
11.1
14
12
9
10
13
April
9.1
13
6
5
9
May
7.3
4
9
7
11
June
6.6
8
3
4
8
July
5.9
5
5
8
6
August
8.9
10
3
6
10
September
5.8
3
7
14
11
October
5.5
3
2
11
8
November
4.1
5
8
1
2
December
11.9
14
20
9
8
Average
8.8
11.9
7.7
7.0
7.4
9.9
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
2.9
3
3
3
3
3
February
3.1
3
3
4
3
3
March
3.7
3
4
5
3
3
April
3.8
3
4
4
4
May
2.4
3
2
2
3
June
2.0
2
2
2
2
July
1.4
2
1
1
1
August
1.2
1
1
1
1
September
1.4
1
2
0
1
October
2.1
2
3
3
2
November
2.2
2
2
2
2
December
2.0
2
1
1
3
Average
2.4
3.0
2.3
2.6
2.1
2.3
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
314°
294°
304°
312°
327°
February
291°
298°
290°
311°
300°
March
304°
297°
273°
291°
272°
April
275°
282°
307°
304°
May
292°
262°
299°
302°
June
319°
303°
291°
310°
July
304°
287°
289°
285°
August
313°
285°
299°
297°
September
297°
320°
225°
294°
October
295°
295°
313°
295°
November
307°
318°
316°
304°
December
300°
273°
290°
313°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.