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
85.1
81
76
95
88
79
February
76.8
92
75
79
76
74
March
88.1
87
89
86
88
84
April
91.4
95
90
92
90
92
May
94.1
92
93
90
97
June
96.5
98
95
97
96
July
97.3
98
95
97
98
August
94.9
99
89
97
95
September
90.6
97
98
88
68
October
89.8
90
93
90
84
November
87.1
77
85
90
92
December
82.8
87
69
79
92
Average
89.7
88.9
89.2
89.8
89.7
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
17.4
16
19
17
17
19
February
19.9
21
20
18
17
20
March
23.4
23
24
22
24
26
April
25.4
26
24
26
25
26
May
29.1
29
31
28
28
June
31.6
32
33
31
31
July
32.7
35
32
32
32
August
33.2
37
32
33
33
September
30.1
34
31
30
20
October
27.3
28
27
28
26
November
21.6
21
21
21
24
December
19.3
19
21
23
17
Average
25.4
21.6
26.8
26.0
25.8
24.9
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
7.3
5
10
5
7
10
February
10.1
11
11
6
6
10
March
13.3
14
14
9
13
17
April
15.6
17
15
16
16
15
May
19.6
19
21
19
19
June
22.4
23
21
24
23
July
23.9
26
23
25
25
August
23.6
25
23
24
21
September
20.0
22
21
21
12
October
16.3
17
13
19
16
November
10.7
11
10
9
12
December
9.2
8
11
14
7
Average
15.5
11.7
16.7
14.9
16.4
15.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.3
7
8
2
1
4
February
5.0
5
7
1
5
6
March
2.8
2
3
3
1
1
April
2.1
1
3
1
3
2
May
2.7
2
2
5
1
June
4.2
1
2
4
2
July
3.7
1
6
4
3
August
4.9
1
5
2
2
September
4.8
1
2
10
2
October
3.5
3
4
1
1
November
4.7
8
9
2
3
December
5.0
6
7
1
3
Average
3.9
3.3
3.5
3.4
3.1
2.5
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
9.4
10
10
10
10
9
February
9.4
10
10
9
9
9
March
9.5
9
10
11
10
9
April
9.6
10
10
12
9
9
May
8.2
7
9
9
8
June
7.1
8
7
8
7
July
6.0
7
7
5
7
August
6.3
8
6
6
6
September
6.4
6
6
7
8
October
7.8
9
8
7
8
November
7.8
8
9
7
9
December
8.3
8
8
9
9
Average
8.2
9.8
8.4
8.5
7.9
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
043°
148°
016°
356°
094°
February
215°
192°
058°
048°
052°
March
127°
153°
162°
128°
154°
April
165°
103°
155°
108°
110°
May
139°
184°
128°
148°
June
209°
200°
149°
133°
July
220°
193°
196°
163°
August
213°
172°
151°
026°
September
114°
054°
085°
056°
October
090°
106°
120°
063°
November
056°
067°
063°
063°
December
067°
118°
177°
122°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.