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
93.7
93
91
100
98
93
February
94.9
88
99
100
94
99
March
96.4
98
88
98
99
98
April
95.9
91
96
97
96
May
92.3
88
93
87
97
June
91.7
91
97
100
88
July
97.3
97
100
100
95
August
98.4
99
99
100
99
September
97.1
93
98
97
98
October
95.5
95
89
95
96
November
95.1
97
91
95
98
December
94.3
91
94
90
98
Average
95.1
93.4
92.9
96.1
95.8
95.9
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
18.1
18
15
20
20
19
February
18.1
16
16
21
20
21
March
19.8
18
16
24
20
18
April
24.6
24
26
25
22
May
25.7
24
27
27
29
June
30.8
26
34
34
30
July
35.3
36
34
36
35
August
35.3
35
36
35
37
September
32.3
28
34
33
36
October
28.0
29
28
27
29
November
23.7
23
20
27
24
December
18.6
20
15
17
20
Average
24.9
17.3
24.4
27.0
26.5
26.6
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
4.3
4
4
5
5
2
February
3.9
7
3
3
4
3
March
5.5
6
6
6
4
6
April
7.7
7
8
8
9
May
10.7
11
12
11
11
June
14.1
12
16
15
13
July
17.4
18
18
19
15
August
17.4
17
21
15
18
September
15.5
16
20
13
14
October
10.9
11
14
11
11
November
6.1
7
6
7
4
December
4.1
6
4
4
4
Average
9.3
5.5
9.8
11.2
9.7
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.8
6
10
0
2
0
February
6.2
15
10
4
0
2
March
6.9
14
18
2
4
10
April
1.9
0
1
0
12
May
1.7
4
1
1
0
June
0.5
1
0
0
2
July
0.1
0
0
0
0
August
0.7
5
0
0
0
September
0.6
2
2
0
0
October
0.6
1
2
2
0
November
2.2
0
5
0
1
December
5.5
3
7
12
3
Average
3.5
11.5
4.6
1.6
1.6
2.4
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
4.4
5
5
4
5
4
February
4.9
4
6
6
5
5
March
5.0
5
5
6
5
5
April
5.3
4
5
6
5
May
5.3
5
6
6
5
June
5.2
4
5
6
5
July
5.3
5
6
6
5
August
5.4
5
6
5
5
September
5.0
4
5
5
5
October
4.8
4
4
5
5
November
4.5
5
5
5
4
December
4.2
4
3
4
6
Average
4.9
4.6
4.7
5.2
5.2
4.9
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
005°
114°
048°
017°
360°
February
147°
077°
027°
345°
338°
March
306°
171°
316°
303°
289°
April
301°
322°
321°
287°
May
302°
313°
312°
300°
June
314°
308°
318°
308°
July
313°
310°
318°
306°
August
312°
310°
312°
304°
September
294°
324°
307°
309°
October
326°
306°
286°
320°
November
017°
005°
341°
325°
December
046°
069°
277°
061°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.