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
77.4
76
91
54
88
82
February
95.7
95
94
97
96
99
March
98.2
99
96
98
100
99
April
99.2
99
98
99
100
May
99.5
99
100
99
100
June
99.6
99
100
100
100
July
99.7
98
100
100
100
August
96.6
96
100
92
89
September
98.5
100
100
95
95
October
95.2
98
100
80
89
November
85.3
89
89
51
91
December
74.0
63
63
55
91
Average
93.3
90.0
93.7
92.6
88.6
94.7
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
15.9
16
15
16
17
14
February
18.5
18
17
20
19
21
March
20.8
21
17
24
21
20
April
26.1
25
26
28
24
May
29.7
29
30
31
31
June
34.8
31
35
36
35
July
38.4
39
38
40
38
August
37.5
37
38
38
38
September
33.6
32
35
34
35
October
27.7
28
29
26
29
November
20.5
22
18
20
19
December
15.9
18
14
14
16
Average
25.6
17.8
25.7
27.3
26.9
26.6
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
6.0
7
7
4
5
5
February
6.1
8
5
5
7
4
March
8.7
9
7
10
8
9
April
12.2
11
11
12
13
May
15.6
15
15
16
16
June
19.8
16
20
22
19
July
23.6
22
23
26
22
August
22.9
23
24
23
24
September
20.0
19
22
20
21
October
13.8
14
16
13
15
November
8.2
8
6
9
7
December
5.6
7
6
6
4
Average
12.9
7.8
12.7
13.7
13.9
13.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.8
4
9
0
1
1
February
3.8
2
6
1
0
1
March
4.6
4
9
5
3
3
April
2.2
0
1
1
10
May
0.8
0
0
0
1
June
0.2
1
0
0
1
July
0.1
0
0
0
0
August
0.4
3
0
0
0
September
0.1
0
0
0
0
October
0.9
2
0
3
0
November
2.7
3
2
0
3
December
4.5
7
3
8
2
Average
2.2
3.3
3.1
1.0
1.2
1.6
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
4.4
4
6
3
6
3
February
4.7
4
5
4
5
4
March
5.0
5
6
5
5
5
April
5.8
6
6
6
6
May
6.4
6
7
6
6
June
6.3
6
6
6
7
July
6.1
6
6
6
6
August
5.7
6
6
6
6
September
5.3
5
5
5
5
October
5.1
5
5
5
4
November
3.9
5
4
3
4
December
4.2
4
4
4
5
Average
5.2
4.4
5.3
5.1
5.4
5.2
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
294°
016°
326°
278°
299°
February
031°
304°
322°
310°
290°
March
308°
321°
302°
302°
302°
April
314°
306°
303°
311°
May
312°
312°
310°
308°
June
311°
313°
311°
311°
July
298°
306°
307°
306°
August
288°
305°
306°
302°
September
297°
303°
305°
292°
October
301°
302°
316°
293°
November
287°
305°
275°
281°
December
274°
310°
307°
300°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.