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
86.1
91
80
94
88
81
February
80.9
88
88
92
69
72
March
88.1
82
82
90
91
100
April
89.6
68
96
93
May
93.6
90
93
95
June
93.2
91
96
89
July
92.6
94
93
89
92
August
79.7
95
97
10
94
September
70.7
91
0
89
October
73.9
90
98
0
90
November
71.4
84
84
0
82
December
76.4
88
76
52
83
Average
84.9
86.7
86.8
92.6
59.8
86.4
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
16.6
15
17
16
16
18
February
19.7
19
21
21
18
20
March
22.2
21
22
24
24
24
April
24.0
19
26
25
May
29.6
27
31
29
June
32.6
30
35
32
July
33.5
33
34
32
34
August
33.5
34
35
33
34
September
31.1
30
31
30
October
26.3
25
23
27
28
November
20.3
19
20
20
24
December
17.7
16
18
22
17
Average
23.2
18.2
24.4
25.4
25.5
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
5.9
3
6
5
7
8
February
8.4
6
9
8
7
9
March
10.5
11
10
11
12
23
April
11.8
8
13
13
May
17.8
16
19
17
June
21.9
20
23
22
July
23.6
23
24
23
24
August
23.1
23
23
23
24
September
19.7
18
19
20
October
14.5
12
9
15
17
November
9.1
8
10
7
13
December
7.7
5
9
11
5
Average
12.8
6.7
13.1
13.5
14.3
15.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.5
6
8
5
13
12
February
8.8
6
6
6
14
13
March
5.5
9
4
5
6
0
April
4.2
4
4
6
May
3.2
5
3
3
June
4.2
3
3
8
July
3.7
3
5
5
3
August
2.4
5
1
0
3
September
4.6
5
0
9
October
4.2
7
0
0
4
November
4.6
5
7
0
5
December
7.0
7
3
4
8
Average
5.2
7.3
4.9
4.0
4.9
6.6
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
5.8
6
5
6
6
6
February
6.2
7
7
6
6
7
March
6.2
6
6
7
6
9
April
5.6
4
6
5
May
5.2
6
5
5
June
5.0
5
5
5
July
3.8
4
4
3
4
August
3.9
5
4
4
3
September
4.9
5
3
6
October
5.1
6
4
4
5
November
5.5
6
7
5
6
December
5.7
6
6
5
5
Average
5.2
6.3
5.3
5.4
4.8
5.1
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
293°
253°
299°
283°
353°
February
322°
244°
264°
344°
228°
March
030°
240°
240°
098°
236°
April
265°
229°
264°
May
015°
238°
172°
June
256°
035°
198°
July
257°
242°
252°
219°
August
289°
202°
164°
231°
September
049°
057°
059°
October
006°
003°
333°
057°
November
021°
025°
014°
040°
December
328°
337°
250°
294°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.