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
98.9
99
100
100
99
100
February
99.6
100
100
100
100
100
March
99.7
100
99
100
100
99
April
99.9
100
100
100
100
May
99.9
100
100
100
100
June
99.9
100
100
100
100
July
99.9
100
100
100
100
August
99.7
100
100
99
100
September
99.9
100
100
100
100
October
100.0
100
100
100
100
November
99.7
100
100
100
100
December
99.9
100
100
100
100
Average
99.7
99.3
99.9
99.9
99.8
99.8
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
14.8
15
12
15
15
16
February
17.1
16
15
18
19
19
March
20.9
19
18
23
20
20
April
27.8
27
28
28
26
May
31.7
32
32
33
34
June
38.1
35
39
40
37
July
41.2
43
40
41
41
August
39.7
38
38
40
41
September
35.6
34
37
36
37
October
27.9
29
29
26
31
November
20.5
20
17
23
21
December
14.9
17
13
14
15
Average
26.3
16.7
26.6
27.9
27.9
28.1
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
5.5
6
4
4
5
5
February
6.8
7
5
6
8
7
March
10.3
10
8
11
9
11
April
15.6
14
15
16
15
May
19.6
20
19
20
21
June
25.5
23
26
28
24
July
29.3
30
29
30
29
August
28.1
27
28
28
29
September
23.7
22
25
24
24
October
15.9
16
18
15
17
November
9.7
10
7
12
10
December
5.6
7
4
6
4
Average
15.3
7.6
15.5
16.3
16.7
16.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.6
4
7
0
2
0
February
3.4
11
2
0
1
0
March
2.3
4
4
0
2
2
April
0.3
0
0
0
1
May
0.2
0
0
0
0
June
0.1
1
0
0
0
July
0.4
0
0
1
0
August
0.5
2
1
0
0
September
0.2
1
1
0
0
October
0.3
0
0
2
0
November
0.7
0
1
0
0
December
1.6
1
2
3
1
Average
1.6
6.3
1.3
0.4
0.8
0.4
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
5.1
5
7
4
5
4
February
6.6
5
8
7
7
6
March
7.7
9
9
7
8
7
April
7.8
8
9
7
6
May
7.1
7
8
7
8
June
6.7
6
7
7
7
July
5.8
6
6
5
6
August
5.7
6
5
6
6
September
5.7
5
5
6
5
October
5.4
5
5
6
4
November
5.0
5
6
4
5
December
4.4
3
4
5
5
Average
6.2
6.4
6.3
6.2
6.0
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
004°
010°
028°
039°
036°
February
235°
323°
009°
358°
028°
March
233°
215°
356°
274°
208°
April
028°
236°
264°
023°
May
185°
238°
244°
207°
June
189°
204°
195°
191°
July
188°
177°
134°
194°
August
176°
129°
190°
192°
September
082°
142°
173°
052°
October
027°
038°
202°
054°
November
356°
029°
058°
327°
December
043°
104°
198°
024°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.