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
83.5
69
88
84
90
89
February
82.8
92
85
78
71
81
March
83.3
77
84
80
86
81
April
83.6
75
77
90
88
87
May
80.7
94
69
89
87
June
88.5
83
88
93
93
July
88.7
83
87
88
91
August
89.8
90
85
88
90
September
87.0
68
96
93
94
October
82.9
88
74
92
74
November
93.0
96
90
98
89
December
83.0
70
80
88
89
Average
84.9
77.8
83.4
83.2
88.7
87.3
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
5.5
6
7
4
5
8
February
8.0
8
8
9
4
8
March
10.6
12
11
12
12
13
April
16.2
16
18
16
17
14
May
21.1
21
22
22
19
June
26.4
25
27
28
27
July
29.7
31
31
29
31
August
28.3
27
30
29
28
September
24.6
23
25
25
24
October
19.4
20
18
21
19
November
12.8
13
15
12
16
December
7.9
10
8
11
8
Average
16.7
10.4
17.7
18.2
17.9
17.8
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
-2.0
-1
0
-5
-2
0
February
-1.5
0
1
-2
-2
0
March
1.6
4
0
3
3
4
April
6.3
7
4
7
6
5
May
11.2
9
12
11
11
June
14.9
7
12
18
17
July
18.0
5
19
20
22
August
17.8
9
16
20
20
September
14.7
8
14
17
16
October
10.1
10
5
12
10
November
2.9
2
2
3
6
December
0.3
2
-1
3
0
Average
7.2
2.4
4.8
7.0
8.9
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.7
25
17
18
8
7
February
14.3
13
9
19
22
18
March
14.6
21
19
15
8
15
April
11.9
15
19
9
10
13
May
10.2
5
11
10
7
June
4.8
6
4
4
5
July
4.3
4
2
3
5
August
5.4
4
4
7
8
September
8.8
20
7
6
3
October
11.8
9
23
2
16
November
7.2
5
9
4
8
December
13.2
16
17
4
16
Average
10.6
18.1
10.7
10.6
7.1
9.5
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
9.4
9
9
9
11
10
February
9.0
8
9
9
9
8
March
10.4
10
11
10
10
9
April
9.9
9
9
11
10
11
May
8.3
8
8
8
9
June
7.5
8
7
7
7
July
6.4
6
7
6
7
August
6.8
7
7
7
7
September
7.4
8
8
8
7
October
7.9
7
8
8
8
November
8.8
8
9
9
9
December
8.5
7
10
8
9
Average
8.4
9.1
7.9
8.4
8.1
8.3
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
297°
279°
287°
297°
283°
February
296°
278°
271°
315°
264°
March
301°
291°
271°
279°
359°
April
017°
178°
281°
283°
292°
May
264°
069°
287°
303°
June
059°
213°
204°
222°
July
200°
188°
220°
184°
August
237°
182°
203°
200°
September
012°
290°
271°
059°
October
281°
017°
319°
328°
November
280°
266°
280°
254°
December
277°
305°
268°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.