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
86.3
86
69
94
92
87
February
87.2
93
89
95
76
79
March
90.0
80
87
86
96
85
April
92.5
84
91
96
96
May
93.1
90
91
98
91
June
93.8
90
98
94
97
July
94.7
96
93
96
99
August
92.4
92
89
92
93
September
93.7
94
90
95
91
October
91.2
84
91
94
95
November
86.6
88
75
100
89
December
81.8
89
64
77
88
Average
90.3
85.6
87.5
88.6
92.6
91.2
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
16.0
16
18
15
15
17
February
19.4
19
22
19
16
17
March
22.0
22
22
23
23
24
April
25.2
25
25
24
25
May
28.9
27
30
28
28
June
31.6
31
34
31
31
July
33.0
34
33
32
34
August
32.3
34
32
32
33
September
30.6
30
29
29
29
October
26.1
25
25
26
27
November
19.8
20
21
19
23
December
16.9
17
17
20
15
Average
24.4
18.9
25.2
25.4
24.6
25.0
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
4.5
3
6
3
5
7
February
7.8
7
10
6
6
7
March
9.4
10
9
9
10
13
April
11.8
13
11
11
12
May
16.4
16
17
15
15
June
20.5
20
20
20
20
July
22.4
23
23
22
23
August
22.3
23
22
23
23
September
19.0
18
18
18
19
October
13.6
11
10
14
15
November
7.3
8
9
5
11
December
5.9
5
9
8
3
Average
12.6
6.5
13.3
13.2
13.1
13.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.8
7
16
6
8
10
February
8.9
10
10
8
13
16
March
8.0
19
11
6
4
9
April
5.2
12
4
2
4
May
4.7
7
7
3
2
June
4.7
8
1
5
4
July
3.1
4
5
4
3
August
4.9
8
7
3
3
September
3.8
4
5
6
7
October
5.7
14
3
4
1
November
6.7
9
14
0
4
December
9.2
11
6
6
7
Average
6.5
12.6
9.2
5.8
4.6
5.3
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
6.6
8
6
7
7
6
February
6.5
7
7
7
7
6
March
6.8
6
6
8
6
6
April
6.6
6
7
6
7
May
5.6
6
6
6
6
June
5.2
6
5
5
5
July
4.4
5
4
4
5
August
4.3
5
4
4
4
September
4.6
5
5
4
5
October
4.9
5
5
4
5
November
5.1
5
6
5
5
December
5.4
6
5
5
6
Average
5.6
6.8
5.6
5.6
5.1
5.5
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
279°
253°
297°
275°
302°
February
238°
261°
263°
319°
267°
March
299°
267°
247°
199°
230°
April
225°
246°
263°
287°
May
350°
226°
192°
281°
June
254°
026°
188°
278°
July
267°
240°
244°
201°
August
306°
161°
137°
211°
September
062°
032°
018°
048°
October
341°
354°
299°
028°
November
007°
324°
341°
013°
December
286°
281°
243°
290°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.