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
97.4
97
98
98
100
100
February
98.4
97
96
100
100
100
March
98.4
98
99
98
100
97
April
99.5
98
100
100
100
May
99.3
100
99
99
100
June
99.9
100
100
100
100
July
99.4
100
100
96
100
August
99.0
97
100
100
96
September
98.9
100
100
99
96
October
97.2
100
100
96
100
November
98.9
100
98
100
100
December
97.2
96
97
98
99
Average
98.5
97.4
98.7
99.3
98.9
98.9
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
15.1
15
13
16
16
16
February
16.2
15
14
18
18
20
March
18.3
17
15
22
19
17
April
24.4
25
25
26
22
May
27.4
27
29
30
30
June
33.7
29
35
37
33
July
37.8
39
38
38
37
August
37.1
35
39
37
38
September
33.1
31
35
34
36
October
27.2
28
29
24
31
November
20.6
20
17
23
20
December
14.8
17
13
14
16
Average
24.4
15.7
24.4
26.7
26.3
26.1
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
1.3
2
3
-1
0
1
February
1.5
4
0
-2
2
1
March
4.6
5
4
5
4
5
April
9.0
8
9
10
10
May
12.4
13
13
14
13
June
17.2
15
18
20
16
July
21.9
23
22
23
20
August
20.5
19
23
20
21
September
15.4
15
18
16
14
October
8.2
9
10
8
9
November
2.5
2
1
4
2
December
0.1
2
1
1
-2
Average
8.9
3.9
9.2
10.1
10.2
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.7
2
7
0
0
0
February
3.9
9
6
1
0
0
March
4.2
5
7
2
3
5
April
1.4
0
0
0
9
May
1.1
1
0
0
5
June
0.0
0
0
0
0
July
0.5
0
0
0
0
August
0.8
5
0
0
0
September
0.1
0
1
0
0
October
0.4
0
0
2
0
November
1.7
1
3
0
1
December
3.7
4
3
7
1
Average
2.1
5.3
2.3
0.7
1.0
1.8
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
7.8
9
9
6
7
10
February
9.4
8
9
9
11
8
March
10.9
13
12
11
11
10
April
12.9
11
14
13
12
May
12.8
13
15
13
12
June
11.3
12
11
11
11
July
10.7
11
10
11
11
August
9.6
8
8
10
10
September
8.3
8
7
9
5
October
7.9
8
6
10
6
November
7.6
7
10
7
7
December
6.5
5
7
8
7
Average
9.8
10.0
9.6
9.7
10.2
9.3
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
282°
265°
043°
298°
279°
February
255°
261°
356°
286°
320°
March
265°
256°
276°
267°
251°
April
270°
268°
254°
263°
May
243°
273°
265°
256°
June
237°
257°
244°
246°
July
241°
244°
242°
240°
August
245°
238°
237°
247°
September
241°
242°
249°
252°
October
268°
254°
264°
251°
November
303°
271°
290°
274°
December
298°
247°
256°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.