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
84.6
75
83
84
96
88
February
80.8
87
86
71
74
82
March
84.3
79
86
73
88
86
April
83.0
73
91
90
88
May
83.2
94
76
89
86
June
85.6
80
87
89
93
July
91.7
90
96
84
92
August
92.6
87
97
90
94
September
89.7
81
95
94
91
October
85.2
87
85
92
74
November
92.8
98
92
98
88
December
82.2
69
82
83
87
Average
85.8
80.2
84.5
86.0
88.7
87.8
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
5.3
5
9
4
5
8
February
7.0
7
8
7
4
8
March
9.8
12
10
11
12
13
April
14.9
17
15
16
14
May
20.3
21
21
21
20
June
25.2
24
26
26
27
July
28.7
29
30
27
31
August
27.8
27
30
28
28
September
24.3
25
25
25
24
October
19.0
20
18
20
18
November
12.3
12
14
12
16
December
7.6
10
8
10
7
Average
15.8
8.1
17.7
17.5
17.1
17.6
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
0
3
-4
-2
1
February
-1.4
0
0
-2
-2
1
March
2.0
4
2
2
2
5
April
6.8
9
7
7
6
May
11.7
11
13
11
11
June
16.8
16
17
17
18
July
21.0
22
22
19
23
August
20.6
20
21
21
22
September
16.7
18
17
18
15
October
11.5
12
10
13
11
November
4.0
3
6
4
6
December
1.0
3
2
3
1
Average
8.2
1.4
9.9
9.4
9.3
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.3
10
11
8
2
4
February
8.3
0
5
15
17
7
March
8.5
15
6
8
5
9
April
7.3
10
5
7
10
May
7.6
5
11
5
3
June
3.8
4
6
3
2
July
2.9
4
1
4
3
August
5.2
9
1
8
9
September
7.0
20
5
5
3
October
7.9
11
8
2
11
November
5.3
2
7
3
8
December
10.8
15
16
3
12
Average
6.8
8.8
8.3
6.8
5.2
6.4
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
9.2
9
8
10
9
9
February
8.9
9
9
9
9
9
March
10.0
10
10
9
10
10
April
9.9
9
10
9
11
May
8.3
7
9
8
9
June
8.0
7
8
8
8
July
7.7
6
9
7
8
August
7.8
8
9
7
8
September
8.2
8
8
9
8
October
8.5
7
8
8
8
November
8.7
8
9
8
9
December
8.8
8
10
8
10
Average
8.7
8.9
7.8
8.9
8.4
8.9
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
310°
293°
313°
325°
294°
February
296°
279°
275°
341°
274°
March
323°
312°
267°
281°
039°
April
166°
284°
290°
311°
May
210°
107°
260°
237°
June
152°
203°
202°
212°
July
200°
203°
210°
191°
August
211°
199°
200°
188°
September
024°
255°
242°
157°
October
267°
044°
300°
327°
November
290°
261°
297°
252°
December
283°
340°
290°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.