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
86.2
81
81
89
88
86
February
81.5
95
87
82
71
77
March
88.7
80
88
87
91
82
April
92.0
84
93
98
92
May
94.2
93
94
96
94
June
94.2
91
95
93
97
July
96.5
98
95
96
97
August
93.6
94
91
94
92
September
93.9
96
92
91
89
October
90.8
94
92
92
91
November
89.5
93
88
98
88
December
80.8
85
65
83
90
Average
90.0
84.8
90.5
89.6
91.3
90.1
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
13.1
12
16
13
12
14
February
17.1
18
19
17
14
15
March
19.7
20
20
21
21
21
April
23.1
23
23
23
22
May
27.1
26
28
26
26
June
30.0
29
32
30
29
July
31.8
33
32
31
32
August
31.2
33
30
31
31
September
29.2
29
28
28
27
October
24.0
24
23
24
24
November
17.8
18
18
18
20
December
14.3
15
14
18
13
Average
22.4
16.5
23.7
23.5
22.8
22.9
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
3.9
2
7
2
4
6
February
7.3
7
9
6
5
6
March
9.4
10
9
9
10
12
April
12.3
13
12
12
11
May
17.4
17
18
16
15
June
20.9
20
22
21
20
July
22.8
23
23
22
23
August
22.5
23
22
23
23
September
20.1
20
19
19
19
October
14.4
14
11
16
15
November
8.0
9
10
6
10
December
6.0
6
8
9
3
Average
12.9
6.3
14.1
13.7
13.6
13.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.3
12
12
14
12
14
February
13.1
6
14
16
15
19
March
9.9
15
12
8
10
17
April
6.8
14
5
3
5
May
5.6
7
4
4
6
June
4.7
7
1
5
4
July
2.8
2
3
5
4
August
5.6
2
6
6
8
September
5.4
3
6
11
11
October
6.5
5
5
8
3
November
8.2
12
9
3
6
December
14.7
13
22
12
7
Average
8.0
11.5
8.2
7.3
7.4
8.3
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
8.5
9
8
8
8
9
February
8.5
9
8
9
9
8
March
8.9
9
8
10
8
8
April
8.5
9
8
8
9
May
7.7
9
8
8
8
June
7.0
8
7
7
7
July
6.3
7
6
6
6
August
6.3
7
6
7
6
September
7.2
7
8
6
8
October
7.6
8
7
7
7
November
7.8
8
9
8
8
December
7.9
8
7
7
8
Average
7.8
8.8
7.8
7.7
7.2
7.7
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
292°
267°
292°
296°
331°
February
278°
259°
290°
339°
272°
March
327°
267°
267°
095°
235°
April
330°
243°
279°
293°
May
056°
214°
232°
260°
June
300°
336°
191°
265°
July
296°
247°
255°
273°
August
303°
215°
137°
231°
September
042°
038°
009°
065°
October
344°
332°
267°
069°
November
033°
032°
323°
019°
December
306°
133°
239°
305°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.