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
97.7
98
97
100
99
99
February
98.3
98
98
100
99
100
March
98.2
98
96
99
98
98
April
98.7
99
99
97
97
May
98.5
100
98
97
98
June
97.8
100
91
98
99
July
98.8
100
100
98
97
August
98.5
98
100
99
96
September
98.1
100
100
96
93
October
98.6
100
100
95
96
November
98.6
99
99
100
99
December
97.9
100
100
99
99
Average
98.3
98.0
98.8
98.5
97.8
97.4
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
14.1
14
11
16
15
15
February
15.4
14
14
17
17
18
March
17.3
17
14
21
17
16
April
23.5
23
24
25
21
May
27.1
27
27
29
29
June
33.2
30
32
36
33
July
37.4
39
37
38
37
August
36.5
34
38
37
38
September
32.1
30
34
33
35
October
26.1
26
27
24
30
November
19.3
19
16
22
19
December
14.2
16
12
14
15
Average
23.6
14.9
23.4
24.7
25.8
25.3
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
3.3
4
3
2
5
3
February
3.3
4
2
1
4
4
March
5.7
6
4
7
5
5
April
9.6
9
6
9
10
May
11.0
13
5
10
10
June
16.1
16
13
14
11
July
19.0
24
24
12
8
August
18.1
20
24
17
8
September
15.3
16
20
15
7
October
10.3
11
13
9
7
November
5.7
5
3
7
5
December
2.6
4
2
3
2
Average
9.4
4.5
10.6
9.7
9.2
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.3
3
0
0
0
0
February
0.8
7
0
0
0
0
March
0.5
5
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.4
3
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.1
1
0
0
0
December
0.6
4
0
0
0
Average
0.6
4.5
0.7
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
8.2
9
10
6
10
9
February
9.8
9
9
9
11
8
March
11.2
14
13
11
12
11
April
12.3
10
15
12
12
May
11.4
11
14
13
11
June
9.8
9
11
10
9
July
8.4
10
10
8
8
August
7.8
8
6
8
8
September
7.8
7
6
9
5
October
7.6
9
6
9
6
November
8.1
9
10
7
8
December
7.3
6
7
8
9
Average
9.4
10.9
9.2
9.6
9.8
8.7
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
280°
267°
050°
333°
278°
February
263°
309°
341°
286°
356°
March
268°
256°
274°
290°
254°
April
277°
279°
282°
277°
May
252°
275°
283°
273°
June
261°
284°
257°
261°
July
265°
264°
225°
241°
August
213°
228°
225°
266°
September
231°
213°
275°
068°
October
296°
344°
276°
283°
November
336°
275°
294°
283°
December
354°
239°
242°
303°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.