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
91.9
92
88
98
96
92
February
92.7
84
96
98
94
96
March
94.1
92
81
99
98
97
April
95.8
95
88
98
98
95
May
93.6
89
96
95
95
June
91.7
97
96
97
92
July
96.6
95
98
95
98
August
97.0
98
100
99
98
September
94.5
93
98
97
86
October
94.5
98
87
97
90
November
91.8
99
97
82
95
December
92.5
92
95
78
96
Average
93.7
90.8
92.7
96.7
94.0
94.1
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
20.1
20
17
22
22
20
February
19.9
18
18
23
21
23
March
21.3
20
18
25
21
21
April
25.2
24
24
27
26
24
May
26.3
24
28
27
30
June
31.1
26
34
33
31
July
35.5
36
35
36
35
August
35.8
35
37
35
38
September
33.5
29
36
34
38
October
30.0
30
29
28
33
November
25.4
25
22
28
26
December
20.6
22
17
18
23
Average
26.3
20.1
25.2
28.1
27.3
28.5
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
6.8
6
7
7
8
5
February
6.4
8
5
6
6
7
March
8.1
8
7
8
6
9
April
10.3
9
9
12
9
13
May
12.8
13
13
13
15
June
15.1
14
16
16
14
July
17.9
17
17
17
18
August
18.5
18
20
18
20
September
17.1
17
18
17
18
October
13.3
13
14
12
15
November
8.7
8
7
10
9
December
6.4
7
5
6
7
Average
11.3
7.7
11.1
12.1
11.4
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.5
4
12
1
3
0
February
5.9
17
8
0
1
0
March
6.4
8
19
2
3
8
April
1.3
2
0
0
0
9
May
1.0
1
0
0
1
June
0.0
0
0
0
1
July
0.1
0
0
0
0
August
0.4
3
0
0
0
September
0.2
1
1
0
0
October
0.5
0
0
1
0
November
1.8
1
2
0
1
December
4.4
2
5
11
3
Average
2.7
7.5
3.7
0.7
1.4
1.7
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
4.2
4
5
5
5
3
February
4.7
4
6
6
5
5
March
5.4
5
5
6
6
5
April
6.0
6
6
7
6
5
May
6.2
6
6
7
6
June
6.0
6
6
6
6
July
5.9
6
6
6
6
August
5.9
6
6
6
6
September
5.4
5
6
5
5
October
5.0
5
5
5
5
November
4.3
5
5
4
4
December
3.6
3
3
3
4
Average
5.2
4.6
5.1
5.7
5.4
5.0
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
252°
284°
059°
358°
281°
February
257°
240°
304°
241°
297°
March
249°
242°
259°
244°
245°
April
252°
250°
247°
248°
249°
May
255°
254°
252°
251°
June
261°
255°
256°
255°
July
261°
256°
257°
259°
August
259°
254°
255°
259°
September
254°
249°
262°
264°
October
260°
250°
247°
269°
November
085°
136°
281°
265°
December
181°
255°
254°
058°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.