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
97.6
98
99
100
98
100
February
98.5
99
100
98
98
97
March
98.7
99
99
100
99
98
April
99.1
100
100
100
100
May
99.6
100
100
100
100
June
99.3
100
100
99
July
99.7
100
100
99
100
August
99.4
100
99
99
100
September
99.8
100
100
100
100
October
99.6
100
100
100
100
November
99.5
100
100
99
99
December
98.4
97
99
99
100
Average
99.1
98.3
99.5
99.5
99.1
99.3
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
14.6
15
15
15
15
15
February
17.3
18
16
17
18
16
March
21.4
21
21
22
22
21
April
27.0
27
28
26
27
May
31.5
31
33
32
32
June
35.5
36
35
35
July
35.7
39
36
33
39
August
34.4
36
33
32
37
September
31.8
35
31
31
32
October
25.9
27
23
27
28
November
20.2
20
17
21
22
December
14.9
16
15
18
14
Average
24.8
17.9
26.4
25.8
25.8
24.1
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
0.2
1
0
0
-1
1
February
2.1
2
1
0
2
3
March
6.0
5
5
4
6
9
April
10.4
6
11
12
12
May
15.0
12
16
16
17
June
19.8
17
21
21
July
21.2
17
23
21
26
August
20.9
16
21
21
24
September
18.1
17
18
18
17
October
11.3
10
11
11
11
November
5.3
5
3
5
7
December
1.3
0
2
4
-2
Average
10.0
2.5
8.6
11.2
11.3
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.1
2
2
1
1
2
February
1.4
1
4
0
3
2
March
1.1
0
2
1
1
4
April
0.2
0
0
1
0
May
1.0
0
0
0
0
June
1.1
0
1
4
July
0.4
0
1
1
0
August
1.4
2
3
2
0
September
1.5
0
1
1
0
October
3.8
0
1
0
2
November
0.1
0
1
0
0
December
1.3
1
2
2
1
Average
1.5
1.0
0.8
0.7
1.2
1.1
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
5.6
8
5
5
4
6
February
7.1
8
6
6
7
7
March
8.6
10
9
7
9
7
April
7.9
8
7
9
8
May
6.1
7
4
8
8
June
6.9
8
7
8
July
5.2
7
5
5
10
August
4.7
6
5
5
5
September
5.2
6
5
5
6
October
5.9
6
4
7
5
November
4.8
6
4
4
6
December
4.8
5
3
5
5
Average
6.3
8.8
6.7
5.2
6.4
6.2
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
255°
270°
274°
255°
270°
February
254°
248°
249°
254°
231°
March
243°
255°
259°
247°
225°
April
238°
254°
215°
247°
May
222°
235°
231°
223°
June
242°
155°
149°
July
132°
119°
117°
109°
August
117°
080°
138°
133°
September
164°
119°
075°
097°
October
189°
249°
241°
173°
November
212°
252°
262°
199°
December
285°
261°
257°
286°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.