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
2021
2020
January
99.1
99
99
February
97.4
99
93
100
100
March
98.8
99
99
99
99
April
89.9
99
99
100
100
May
82.0
100
100
100
June
96.8
100
100
100
July
99.9
100
100
100
August
99.4
96
100
100
September
98.8
100
99
96
October
98.1
98
94
100
November
98.6
100
100
100
December
96.6
99
100
100
Average
96.4
98.9
98.7
99.4
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
2021
2020
January
14.8
15
15
February
14.9
14
13
16
18
March
17.1
17
14
18
16
April
23.5
22
24
25
21
May
27.1
26
28
29
June
33.2
29
37
33
July
37.2
38
38
37
August
36.3
34
37
38
September
31.9
30
33
34
October
25.5
26
24
28
November
20.1
18
22
20
December
14.5
15
12
17
Average
24.6
16.9
24.6
28.0
26.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2021
2020
January
1.4
2
2
February
2.4
3
2
4
3
March
2.8
4
2
2
3
April
6.4
6
7
8
8
May
10.5
10
13
11
June
15.1
12
20
14
July
19.5
20
22
16
August
18.6
18
19
19
September
14.9
16
16
16
October
8.8
9
10
11
November
4.0
3
6
4
December
1.2
3
1
1
Average
8.8
3.5
9.3
12.2
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2021
2020
January
4.1
4
0
February
5.5
11
10
0
0
March
4.3
7
9
2
4
April
1.1
1
0
0
7
May
0.6
1
0
0
June
0.0
0
0
0
July
0.2
1
0
0
August
1.3
9
0
1
September
0.1
0
0
0
October
0.0
0
0
0
November
0.5
1
0
1
December
4.3
4
12
0
Average
1.9
5.4
2.6
0.7
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
2021
2020
January
5.3
5
6
February
6.6
5
9
7
6
March
7.5
8
9
8
6
April
8.3
7
7
9
7
May
7.6
7
9
7
June
6.9
6
7
7
July
5.9
7
5
5
August
6.0
6
6
6
September
5.9
5
7
5
October
5.7
6
6
5
November
5.1
5
6
5
December
4.0
2
5
5
Average
6.4
6.4
6.2
6.9
6.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2021
2020
January
289°
293°
February
276°
291°
056°
353°
March
281°
297°
309°
300°
April
280°
305°
298°
296°
May
304°
297°
290°
June
298°
294°
294°
July
293°
309°
293°
August
279°
296°
297°
September
301°
317°
009°
October
326°
312°
317°
November
348°
046°
299°
December
296°
294°
074°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.