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
86.8
88
76
91
85
90
February
80.9
92
79
81
83
79
March
88.5
86
88
80
90
85
April
93.7
90
92
97
94
May
93.4
93
90
96
96
June
92.1
93
94
89
95
July
90.1
90
84
87
90
August
90.7
96
85
92
90
September
94.3
98
90
91
94
October
91.6
94
90
91
91
November
88.1
82
84
97
90
December
80.3
88
70
78
89
Average
89.4
88.3
89.0
86.6
89.8
90.5
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
13.7
12
16
14
13
15
February
18.0
18
20
18
14
16
March
20.7
20
21
22
21
22
April
23.7
24
24
23
23
May
27.7
27
29
26
27
June
30.4
31
32
30
30
July
31.8
33
32
30
32
August
31.6
34
31
31
32
September
30.0
31
29
28
28
October
24.6
25
24
24
25
November
18.3
18
19
18
20
December
15.3
15
17
20
14
Average
23.0
16.7
24.4
24.5
23.2
23.5
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
3.7
2
7
2
4
6
February
7.2
6
9
5
4
6
March
9.5
10
9
8
10
14
April
12.0
13
13
11
11
May
16.7
16
18
15
15
June
20.3
19
22
21
20
July
21.9
22
21
22
23
August
22.1
23
22
23
22
September
19.6
19
19
19
19
October
13.8
13
11
15
14
November
6.6
6
9
5
10
December
5.6
4
10
9
2
Average
12.4
6.0
13.4
13.3
13.2
13.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.6
12
9
10
5
9
February
10.2
10
14
11
7
15
March
7.5
10
9
8
10
11
April
3.9
8
5
1
3
May
3.7
4
5
1
4
June
4.4
3
1
7
5
July
2.5
2
3
5
4
August
5.1
3
8
8
4
September
3.1
1
4
6
4
October
5.1
2
3
3
7
November
5.4
6
7
1
6
December
8.0
2
10
6
6
Average
6.0
10.7
5.1
5.7
4.9
6.2
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
5.2
5
5
5
5
5
February
5.4
6
5
6
6
6
March
5.5
5
5
5
5
5
April
5.2
5
6
5
5
May
4.2
4
4
5
5
June
3.7
4
3
4
4
July
3.4
3
4
3
3
August
3.3
4
3
3
4
September
3.6
3
3
3
4
October
4.2
5
4
4
4
November
4.2
4
4
4
5
December
4.6
5
4
4
4
Average
4.4
5.1
4.2
4.3
4.1
4.4
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
286°
245°
308°
278°
276°
February
226°
210°
205°
309°
269°
March
327°
260°
229°
178°
207°
April
233°
192°
248°
298°
May
257°
195°
171°
215°
June
254°
274°
169°
198°
July
283°
210°
211°
233°
August
300°
197°
193°
234°
September
358°
013°
002°
103°
October
290°
298°
208°
092°
November
334°
339°
323°
001°
December
270°
207°
199°
287°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.