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
87.0
83
73
92
86
89
February
81.2
86
88
86
69
84
March
88.7
79
89
89
90
86
April
90.7
83
89
97
98
May
91.4
91
84
96
June
92.1
94
94
87
July
93.0
91
91
94
August
84.9
97
91
96
September
89.2
96
85
87
89
October
88.5
94
92
78
88
November
87.9
83
80
98
89
December
79.2
88
73
67
86
Average
87.5
82.5
89.1
87.8
87.5
88.4
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
17.2
17
20
16
17
18
February
20.6
20
23
19
17
19
March
23.2
23
24
23
23
26
April
25.8
26
26
25
26
May
29.7
30
30
29
June
31.9
33
34
30
July
32.8
34
33
32
August
29.9
36
32
32
September
30.1
32
32
30
28
October
27.1
27
26
27
27
November
21.3
21
22
21
24
December
18.2
18
21
22
17
Average
24.5
20.1
27.0
26.3
25.2
22.6
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
5.9
4
9
4
7
8
February
9.6
8
12
7
7
8
March
11.1
11
12
11
12
16
April
13.2
14
13
15
13
May
17.4
18
18
17
June
21.5
21
23
21
July
22.5
24
23
23
August
20.8
24
22
23
September
20.1
20
25
20
21
October
15.7
14
11
18
17
November
9.3
9
11
7
13
December
8.1
7
10
12
5
Average
13.3
7.6
15.4
14.7
15.0
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.5
16
12
7
8
10
February
9.3
15
5
8
6
11
March
7.0
11
13
7
7
6
April
4.8
7
2
1
2
May
3.9
1
6
3
June
5.9
1
2
9
July
4.5
7
3
6
August
6.2
8
9
7
September
2.9
2
0
4
12
October
5.0
5
3
4
2
November
4.8
15
4
1
3
December
9.0
12
6
3
4
Average
6.8
14.0
6.9
4.6
4.8
6.4
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
5.5
6
5
6
4
6
February
6.1
6
7
6
5
6
March
6.1
5
6
6
7
7
April
5.8
6
6
5
6
May
4.8
5
5
6
June
4.3
5
4
5
July
3.6
3
4
3
August
3.3
4
4
3
September
4.2
4
4
3
6
October
4.5
5
4
4
5
November
5.1
6
6
4
6
December
5.0
5
4
5
4
Average
5.0
5.6
5.1
4.9
4.5
5.7
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
270°
221°
048°
296°
111°
February
196°
216°
167°
109°
152°
March
044°
205°
200°
169°
201°
April
129°
186°
195°
058°
May
070°
182°
149°
June
230°
078°
153°
July
263°
205°
165°
August
293°
151°
085°
September
067°
128°
091°
083°
October
058°
065°
090°
062°
November
053°
049°
030°
056°
December
072°
104°
188°
070°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.