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
99.3
99
99
100
100
100
February
98.0
98
100
98
100
100
March
99.5
98
99
100
99
100
April
99.1
95
100
100
100
May
99.3
96
100
100
100
June
99.0
95
100
100
100
July
98.4
94
97
99
100
August
99.5
99
99
100
100
September
99.7
99
100
100
100
October
99.6
100
99
100
99
November
99.6
100
99
100
100
December
99.3
100
97
100
100
Average
99.1
98.1
97.9
99.1
99.7
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
18.8
18
17
19
19
19
February
20.0
21
19
20
21
20
March
23.7
22
22
25
23
23
April
29.6
29
30
29
29
May
33.1
33
34
34
35
June
38.1
37
38
39
38
July
38.1
41
37
35
39
August
37.3
38
35
36
40
September
35.3
36
35
34
36
October
29.4
32
28
29
32
November
25.1
25
21
27
27
December
19.3
21
17
20
19
Average
28.0
20.0
29.0
28.5
28.9
29.7
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
4.9
5
4
5
5
5
February
6.0
7
4
4
6
6
March
8.2
8
7
7
8
9
April
12.0
10
11
14
11
May
15.5
13
16
17
18
June
21.5
20
23
24
21
July
24.3
26
24
23
25
August
22.4
25
23
15
26
September
19.5
21
22
16
23
October
14.3
16
15
12
15
November
9.0
12
6
7
8
December
6.2
7
5
7
6
Average
12.8
6.6
13.7
13.7
12.7
14.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.8
8
8
2
2
3
February
5.2
9
9
4
0
2
March
2.8
8
5
2
2
4
April
0.2
0
0
0
1
May
0.2
0
0
0
0
June
0.6
0
2
0
1
July
3.0
1
4
6
3
August
2.0
2
6
3
0
September
1.2
2
1
1
0
October
1.0
1
2
0
1
November
1.2
3
1
0
1
December
4.2
7
10
4
0
Average
2.6
8.3
2.8
2.5
1.5
1.2
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
6.0
5
6
7
6
6
February
6.7
6
8
7
7
7
March
6.9
7
7
7
8
6
April
7.3
7
8
8
7
May
7.0
8
7
7
6
June
6.8
8
7
7
7
July
6.0
6
6
5
7
August
5.4
6
5
5
6
September
6.5
7
8
4
7
October
6.7
7
7
6
7
November
6.2
7
6
6
7
December
5.7
5
5
5
7
Average
6.4
6.2
6.9
6.7
6.0
6.5
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
210°
215°
096°
159°
238°
February
212°
217°
211°
259°
251°
March
221°
247°
252°
234°
227°
April
235°
235°
223°
247°
May
204°
224°
227°
246°
June
221°
209°
256°
249°
July
270°
227°
214°
298°
August
173°
134°
210°
276°
September
212°
132°
184°
118°
October
168°
146°
205°
216°
November
157°
220°
126°
161°
December
125°
245°
198°
090°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.