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
87.8
78
91
88
90
93
February
87.8
95
94
85
77
84
March
87.3
79
89
81
89
86
April
91.4
89
89
94
93
May
87.0
97
77
95
90
June
93.5
86
97
93
97
July
95.8
95
96
99
98
August
94.6
94
97
97
95
September
89.0
84
91
97
90
October
89.1
94
82
91
84
November
93.5
95
90
99
94
December
84.5
69
71
96
95
Average
89.8
83.6
90.0
87.7
93.8
91.6
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
7.2
8
10
5
6
9
February
10.7
11
13
11
6
11
March
13.5
15
14
15
15
16
April
19.3
22
18
19
17
May
23.4
22
23
23
21
June
28.0
27
28
28
28
July
30.7
31
30
31
32
August
29.2
29
30
30
29
September
25.9
26
26
26
24
October
20.7
21
18
22
20
November
13.7
14
15
13
17
December
9.5
11
8
13
9
Average
18.4
11.3
19.8
19.3
19.5
19.4
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
-1.1
0
2
-4
-1
1
February
0.7
1
2
-1
-1
1
March
3.1
5
2
4
4
6
April
8.3
9
7
8
7
May
12.7
11
13
11
12
June
17.8
16
18
19
18
July
20.6
21
21
21
22
August
19.0
20
20
21
21
September
16.0
16
16
15
16
October
10.8
10
8
13
11
November
3.6
3
5
2
6
December
0.8
3
0
2
0
Average
8.5
2.2
9.6
9.2
9.6
10.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.3
21
13
14
7
4
February
12.2
10
12
15
15
12
March
9.7
13
10
16
8
5
April
8.4
12
11
5
9
May
9.0
8
12
9
5
June
6.1
12
8
5
3
July
5.2
5
9
1
3
August
5.5
10
1
5
10
September
7.9
16
10
4
5
October
8.0
7
15
6
11
November
7.9
10
11
4
9
December
9.2
10
18
1
6
Average
8.8
14.9
10.3
11.2
5.4
6.5
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
8.6
9
8
9
8
7
February
8.4
8
9
9
8
8
March
9.5
8
10
11
9
7
April
8.9
8
9
9
8
May
7.3
7
7
7
8
June
7.2
8
7
7
7
July
5.9
6
6
7
5
August
6.0
7
6
5
6
September
6.7
7
7
7
6
October
7.2
7
8
8
7
November
7.9
7
9
8
8
December
7.3
6
7
7
9
Average
7.6
8.6
7.4
7.8
7.4
7.1
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°
282°
303°
313°
293°
February
283°
267°
265°
302°
270°
March
314°
284°
267°
287°
257°
April
235°
297°
285°
289°
May
014°
066°
301°
306°
June
313°
266°
213°
216°
July
216°
213°
233°
223°
August
243°
227°
148°
211°
September
008°
326°
259°
034°
October
289°
326°
288°
278°
November
305°
255°
298°
250°
December
287°
296°
255°
274°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.