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
87.4
88
79
93
87
89
February
86.9
94
87
88
79
83
March
91.3
86
90
87
93
87
April
92.9
87
90
98
95
May
92.9
92
94
98
92
June
93.3
95
93
89
96
July
93.4
91
93
94
94
August
91.1
94
92
90
90
September
92.3
94
94
89
92
October
91.8
94
92
90
92
November
90.8
93
89
98
94
December
85.3
91
77
82
87
Average
90.8
89.2
90.7
90.9
90.9
91.0
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
16.0
15
17
15
15
18
February
19.6
18
21
20
17
17
March
22.1
21
21
23
23
24
April
25.5
25
25
26
25
May
29.3
26
30
29
28
June
31.9
30
33
32
32
July
33.7
33
33
33
35
August
33.0
33
32
33
34
September
30.9
29
29
30
30
October
26.4
25
24
26
28
November
19.9
19
20
20
23
December
16.8
17
16
21
15
Average
24.6
17.9
24.6
25.3
25.4
25.7
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
3.5
2
4
2
4
7
February
6.6
4
7
5
5
7
March
8.1
9
8
8
9
12
April
10.8
11
9
10
12
May
15.8
15
16
14
15
June
19.5
18
20
20
21
July
22.2
22
22
22
23
August
22.1
22
21
23
23
September
18.5
17
17
18
19
October
13.5
11
10
14
15
November
6.3
6
9
4
10
December
5.1
4
7
7
2
Average
11.8
4.9
12.0
12.5
12.4
13.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.1
7
10
7
11
10
February
8.4
8
10
5
14
17
March
6.6
9
7
8
5
10
April
4.8
9
3
2
6
May
5.2
8
4
2
5
June
3.8
3
4
6
3
July
4.2
7
6
5
5
August
5.0
5
7
5
5
September
4.3
6
3
5
7
October
3.9
5
3
3
2
November
5.7
7
13
2
4
December
10.7
12
10
8
7
Average
6.0
8.3
7.2
5.3
5.3
6.3
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
6.5
7
6
7
6
7
February
6.6
6
7
7
7
7
March
7.0
7
6
8
7
7
April
6.6
6
6
6
7
May
5.9
7
6
6
6
June
5.3
6
5
6
6
July
4.7
5
5
5
5
August
4.5
5
4
4
4
September
5.1
4
6
4
6
October
5.1
5
5
4
5
November
5.3
5
6
5
6
December
5.5
6
5
5
5
Average
5.8
6.6
5.6
5.8
5.3
5.8
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
272°
256°
315°
277°
294°
February
255°
252°
227°
310°
273°
March
297°
247°
249°
062°
235°
April
266°
242°
262°
260°
May
358°
234°
236°
276°
June
271°
096°
176°
284°
July
260°
224°
209°
220°
August
263°
171°
143°
192°
September
046°
032°
015°
033°
October
347°
016°
293°
032°
November
010°
255°
341°
021°
December
284°
022°
262°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.