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
88.8
77
97
91
91
92
February
87.4
97
94
87
80
82
March
89.3
84
92
87
88
89
April
91.6
87
94
96
91
May
88.1
97
82
96
91
June
93.5
82
97
94
97
July
96.7
94
97
100
98
August
96.1
97
96
96
96
September
92.1
93
92
97
93
October
89.7
95
86
92
84
November
94.1
96
89
99
93
December
83.9
75
73
95
94
Average
90.7
85.7
91.7
90.1
93.9
91.9
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
7.2
7
11
5
7
9
February
10.4
11
13
11
6
11
March
13.7
15
14
15
15
16
April
19.6
22
19
20
17
May
24.0
24
24
25
22
June
29.0
28
29
30
29
July
31.9
32
32
32
33
August
30.3
30
32
31
30
September
26.8
27
27
27
25
October
21.3
22
19
23
21
November
14.0
15
16
13
17
December
9.5
11
9
13
9
Average
18.8
11.0
20.8
20.1
20.3
20.0
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
-1.2
0
3
-4
-1
1
February
0.5
1
2
-1
-1
1
March
3.0
5
3
3
4
6
April
8.5
10
8
8
7
May
13.3
11
14
12
12
June
18.1
17
18
19
19
July
21.7
22
22
22
23
August
20.7
21
21
22
22
September
17.2
17
17
17
16
October
11.3
11
9
14
11
November
3.6
3
6
3
6
December
1.0
3
1
3
0
Average
8.9
1.7
10.3
9.8
10.2
10.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.5
21
13
13
11
7
February
14.3
8
9
19
22
16
March
11.1
15
11
12
10
10
April
8.8
12
10
5
10
May
10.5
4
14
9
8
June
5.7
10
6
5
4
July
4.4
5
4
2
3
August
4.9
3
2
5
9
September
8.4
9
11
6
6
October
8.4
4
16
5
8
November
7.7
8
11
4
9
December
11.9
10
18
3
8
Average
9.4
14.6
7.8
10.5
6.9
7.7
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
7.9
8
8
7
8
8
February
7.5
7
8
8
7
7
March
8.8
9
9
9
8
7
April
8.5
8
9
9
9
May
7.1
6
7
7
9
June
6.6
7
6
6
7
July
5.6
5
5
6
6
August
5.7
6
6
5
6
September
6.1
6
6
6
6
October
6.5
6
6
7
6
November
7.0
7
7
7
7
December
6.7
6
7
6
7
Average
7.1
7.9
6.7
6.9
6.8
6.9
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
300°
289°
303°
305°
291°
February
302°
274°
282°
308°
271°
March
299°
296°
270°
290°
287°
April
263°
291°
285°
295°
May
020°
069°
303°
328°
June
352°
275°
204°
272°
July
217°
225°
249°
239°
August
268°
233°
131°
233°
September
011°
315°
264°
051°
October
284°
323°
312°
293°
November
294°
281°
287°
267°
December
300°
297°
256°
279°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.