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
98.8
97
97
99
99
100
February
99.3
100
100
99
100
100
March
99.4
100
100
100
98
100
April
99.7
100
99
100
100
May
99.4
100
98
99
100
June
99.8
99
100
100
100
July
99.6
100
99
100
100
August
99.7
100
100
99
100
September
99.0
96
100
100
100
October
99.6
100
98
99
100
November
99.5
99
100
99
100
December
99.3
97
100
100
100
Average
99.4
98.9
99.0
99.3
99.4
99.9
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
11.5
11
10
12
12
12
February
13.9
14
13
15
15
15
March
18.5
19
14
21
18
18
April
25.3
25
26
26
24
May
29.7
30
31
31
32
June
36.5
33
37
39
36
July
39.3
41
39
39
39
August
37.2
36
36
38
40
September
33.7
32
35
34
35
October
25.3
27
26
24
28
November
17.3
17
14
20
18
December
11.4
14
10
11
11
Average
24.0
14.6
24.3
25.7
25.6
25.6
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
0.1
0
1
-1
0
-1
February
1.7
4
0
1
2
1
March
5.7
7
4
6
4
7
April
10.1
9
10
11
10
May
14.8
15
15
15
16
June
20.6
18
22
23
20
July
24.5
24
24
26
24
August
22.3
22
24
23
23
September
18.6
17
21
19
18
October
10.4
11
12
10
11
November
4.1
4
2
6
4
December
0.3
1
0
2
-2
Average
10.4
3.6
10.5
11.5
11.7
10.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
10
14
1
4
1
February
5.5
12
7
1
0
2
March
6.1
3
16
3
6
9
April
1.5
2
1
1
2
May
0.9
1
0
0
0
June
0.5
3
0
1
0
July
0.4
0
1
1
0
August
1.1
5
1
0
0
September
1.6
7
2
1
0
October
1.0
0
0
3
0
November
2.0
2
2
0
1
December
2.8
2
4
5
2
Average
2.9
7.9
4.7
1.1
1.7
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
3.2
3
5
3
4
3
February
4.8
4
6
5
4
5
March
5.9
7
6
6
6
6
April
6.8
6
8
7
6
May
7.2
7
8
8
8
June
7.3
7
8
7
8
July
6.2
6
7
6
7
August
5.4
5
5
6
5
September
5.1
4
5
4
5
October
4.0
3
4
5
4
November
2.9
3
5
2
3
December
3.0
3
3
4
3
Average
5.2
4.7
5.1
5.7
5.3
5.2
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
216°
191°
035°
115°
247°
February
245°
236°
008°
275°
349°
March
229°
247°
229°
238°
231°
April
260°
248°
246°
260°
May
241°
266°
241°
236°
June
247°
258°
247°
248°
July
260°
237°
254°
259°
August
225°
257°
249°
268°
September
272°
249°
261°
315°
October
280°
233°
232°
270°
November
270°
206°
217°
231°
December
262°
218°
218°
316°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.