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
65.8
60
82
54
71
64
February
86.1
80
81
87
90
89
March
94.2
92
92
96
97
96
April
98.5
96
100
99
100
97
May
99.3
100
99
100
100
June
99.2
97
99
100
99
July
99.5
100
100
99
100
August
96.0
99
100
96
86
September
95.3
99
100
97
76
October
90.9
95
98
78
80
November
75.5
88
75
59
81
December
65.8
71
58
65
70
Average
89.0
82.1
92.2
89.9
88.5
87.2
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
15.0
15
15
16
16
14
February
17.8
18
16
20
19
20
March
20.3
21
16
23
20
20
April
25.9
25
25
26
28
25
May
29.9
29
31
32
31
June
34.8
32
36
36
35
July
38.3
39
38
39
38
August
37.7
37
39
38
38
September
33.9
33
36
35
34
October
27.7
29
29
25
30
November
19.9
22
18
19
19
December
14.8
18
13
13
15
Average
25.6
19.7
26.0
27.4
26.6
26.4
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
4.6
6
5
2
3
4
February
4.1
7
2
2
4
3
March
6.7
8
6
7
5
7
April
9.6
9
9
9
9
11
May
12.9
13
13
13
14
June
16.5
15
17
18
15
July
19.5
20
20
21
18
August
18.7
19
20
18
19
September
15.8
17
18
16
16
October
9.5
11
11
9
11
November
4.9
5
2
8
4
December
3.6
5
4
5
2
Average
10.2
7.5
10.6
10.5
10.6
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.3
5
9
0
6
2
February
4.1
5
6
1
0
0
March
5.3
6
12
3
2
7
April
1.8
3
0
0
1
4
May
0.7
1
0
0
0
June
0.3
0
0
3
0
July
0.0
0
0
0
0
August
0.1
1
0
0
0
September
0.0
0
0
0
0
October
0.5
0
0
2
1
November
3.5
2
5
0
4
December
5.2
4
4
13
2
Average
2.3
4.5
2.6
0.9
2.1
1.6
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
3.1
3
4
2
3
3
February
4.0
3
4
3
5
3
March
4.4
5
6
4
4
4
April
5.1
5
6
6
4
5
May
5.3
5
7
6
5
June
5.0
4
6
5
5
July
4.4
4
5
4
4
August
4.2
4
5
4
4
September
4.1
5
4
4
4
October
3.6
3
4
4
3
November
2.7
3
3
3
3
December
2.8
3
2
3
3
Average
4.1
4.0
4.1
4.3
4.1
3.8
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
310°
152°
315°
304°
308°
February
187°
191°
295°
323°
090°
March
301°
240°
326°
317°
258°
April
309°
317°
322°
312°
319°
May
309°
322°
321°
322°
June
318°
323°
320°
325°
July
317°
317°
311°
314°
August
308°
314°
311°
317°
September
316°
309°
320°
330°
October
322°
321°
317°
325°
November
326°
314°
304°
323°
December
321°
172°
124°
328°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.