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
74.9
81
90
75
76
56
February
93.7
91
92
96
97
96
March
97.3
99
95
99
100
99
April
98.3
100
99
99
99
May
99.7
100
100
100
100
June
99.6
100
100
100
100
July
98.6
100
96
97
100
August
97.6
100
100
95
90
September
96.8
99
100
100
75
October
97.6
98
99
97
92
November
85.6
95
97
69
92
December
76.5
78
67
76
76
Average
92.6
90.5
95.8
95.0
92.7
89.4
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
14.8
16
14
16
16
14
February
17.3
18
15
19
18
20
March
19.2
20
16
23
19
19
April
24.0
24
25
25
24
May
28.2
26
30
29
30
June
33.2
30
35
32
34
July
35.8
37
35
35
36
August
34.9
36
36
34
37
September
32.1
30
34
32
34
October
27.1
28
28
23
30
November
19.4
21
17
18
20
December
14.7
17
12
12
16
Average
24.2
17.5
24.5
26.3
24.3
26.0
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
5.6
7
6
3
6
6
February
5.1
7
3
3
6
5
March
7.0
8
7
7
5
8
April
9.1
8
9
7
11
May
11.8
11
12
12
13
June
14.9
13
16
14
16
July
16.8
17
17
17
16
August
16.9
18
17
15
19
September
15.1
15
17
13
17
October
10.7
11
12
10
13
November
5.8
6
4
7
5
December
4.7
5
4
6
4
Average
9.9
7.1
10.0
10.1
9.6
10.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.9
7
13
0
7
5
February
7.5
9
15
0
3
0
March
8.4
4
16
3
2
16
April
3.7
1
5
0
8
May
1.7
2
0
0
2
June
0.2
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.5
0
1
0
0
October
0.7
0
0
4
0
November
3.7
4
3
1
2
December
7.2
6
11
11
4
Average
4.0
6.6
4.4
1.6
2.0
2.7
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
6.5
7
9
4
7
5
February
7.6
7
8
6
7
8
March
7.2
6
9
7
6
6
April
7.6
7
8
6
7
May
8.3
7
10
9
8
June
7.7
6
8
8
9
July
6.7
6
7
7
7
August
6.4
6
7
7
7
September
6.3
6
7
6
6
October
5.9
5
6
6
5
November
4.7
4
5
4
6
December
5.7
5
6
7
5
Average
6.8
6.5
6.5
6.7
6.7
6.6
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
153°
172°
292°
144°
185°
February
161°
211°
309°
305°
321°
March
273°
198°
299°
292°
272°
April
292°
297°
294°
296°
May
277°
300°
295°
300°
June
297°
299°
295°
290°
July
299°
298°
307°
307°
August
300°
306°
304°
304°
September
299°
293°
306°
312°
October
302°
306°
286°
309°
November
285°
276°
305°
300°
December
184°
180°
162°
276°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.