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
87.7
86
82
88
88
82
February
78.7
87
81
78
67
82
March
84.5
82
78
83
74
89
April
91.1
91
86
97
93
94
May
96.6
95
94
96
98
June
96.8
97
96
95
96
July
98.4
98
98
98
100
August
98.8
100
98
98
100
September
96.6
94
97
96
94
October
94.1
95
93
98
90
November
92.2
90
86
97
95
December
81.2
85
77
71
90
Average
91.3
86.4
90.2
91.4
90.2
93.0
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
17.0
16
19
16
17
18
February
19.6
19
21
18
18
19
March
21.9
22
22
22
22
24
April
24.1
24
24
24
24
25
May
27.9
27
28
27
28
June
30.4
30
32
30
31
July
31.2
32
31
31
31
August
31.3
34
31
31
32
September
30.2
30
30
29
30
October
26.7
26
25
26
28
November
21.5
21
22
20
25
December
18.5
18
21
21
18
Average
24.5
20.1
25.3
25.0
24.7
25.6
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
7.0
6
9
5
7
9
February
10.6
9
11
7
9
10
March
12.7
13
13
11
13
17
April
14.7
16
15
15
13
15
May
18.7
18
20
18
18
June
22.7
22
23
22
23
July
23.8
23
24
24
24
August
23.8
24
23
24
24
September
21.6
21
21
20
22
October
16.8
15
13
18
18
November
10.4
11
12
8
14
December
9.2
9
12
12
6
Average
15.4
10.7
16.0
15.6
15.6
16.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.5
12
10
14
7
11
February
8.9
11
13
12
6
10
March
6.4
5
8
10
9
2
April
5.1
3
9
3
5
4
May
4.4
6
9
3
3
June
7.8
7
5
6
6
July
6.7
6
11
8
6
August
7.9
1
17
7
11
September
7.8
10
8
10
11
October
5.4
6
3
4
4
November
6.9
19
5
3
5
December
8.3
14
7
3
6
Average
6.9
7.4
8.7
8.6
5.8
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
8.6
10
8
9
8
9
February
8.3
8
9
9
9
9
March
8.9
9
9
10
9
8
April
8.7
10
8
9
8
8
May
7.4
7
8
9
8
June
7.0
8
7
8
8
July
6.3
7
6
6
7
August
6.3
8
6
7
7
September
6.7
6
7
6
9
October
7.8
7
7
7
8
November
7.8
8
9
7
9
December
7.6
8
6
7
8
Average
7.7
8.9
7.5
7.7
7.5
8.0
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
048°
214°
025°
332°
060°
February
125°
155°
073°
029°
105°
March
068°
147°
163°
122°
173°
April
139°
137°
147°
118°
202°
May
169°
177°
149°
165°
June
218°
207°
167°
166°
July
242°
201°
208°
201°
August
206°
188°
169°
196°
September
106°
076°
138°
095°
October
052°
084°
100°
075°
November
043°
057°
042°
054°
December
063°
089°
154°
032°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.