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
88.9
89
86
94
88
86
February
84.7
92
84
84
80
73
March
91.7
89
94
95
88
100
April
94.5
92
100
94
77
May
92.0
98
99
79
72
June
98.6
100
100
97
93
July
98.4
99
98
99
96
August
96.4
98
94
98
100
September
98.0
98
99
98
89
October
95.4
95
97
96
88
November
85.7
78
83
98
83
December
78.9
81
79
80
94
Average
91.6
90.0
92.5
94.2
90.3
88.9
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
16.8
17
21
18
18
16
February
19.4
21
22
19
18
16
March
21.8
23
24
23
23
23
April
23.6
25
26
24
24
May
27.8
29
30
27
26
June
30.4
32
33
30
28
July
31.0
34
32
31
29
August
30.8
36
31
32
29
September
29.0
33
31
27
28
October
23.6
27
27
17
24
November
18.4
21
22
21
19
December
17.5
19
22
23
14
Average
23.6
20.2
26.9
26.2
24.1
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
8.2
7
11
5
8
11
February
11.8
10
13
9
7
11
March
13.8
14
15
12
14
17
April
15.7
17
17
15
17
May
20.9
21
21
19
20
June
23.9
24
24
23
23
July
24.4
25
23
24
24
August
24.6
26
24
24
24
September
21.6
23
21
16
23
October
14.1
17
14
12
18
November
10.0
12
12
11
15
December
10.3
9
13
14
8
Average
15.8
10.2
17.5
16.3
15.6
17.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.2
6
1
1
2
7
February
1.7
2
0
2
2
0
March
2.4
5
2
1
2
0
April
2.2
4
1
3
2
May
1.9
1
2
3
0
June
2.4
1
1
5
9
July
3.3
2
3
3
6
August
2.0
1
2
3
4
September
2.6
2
1
5
13
October
1.3
2
0
0
0
November
3.6
5
6
0
0
December
3.1
3
5
0
0
Average
3.2
3.9
2.0
1.9
2.3
4.3
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
9.0
9
10
9
8
10
February
9.0
8
10
10
9
9
March
9.1
8
9
10
9
8
April
9.2
9
11
9
9
May
7.5
6
8
9
7
June
6.4
6
6
7
7
July
5.0
5
5
4
6
August
4.9
6
4
4
5
September
5.6
5
6
7
7
October
7.4
8
7
7
9
November
7.6
7
9
7
8
December
7.9
8
7
8
11
Average
7.4
8.5
7.3
7.5
7.4
7.5
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
053°
160°
011°
333°
039°
February
196°
173°
092°
044°
168°
March
107°
154°
168°
121°
157°
April
081°
137°
102°
164°
May
134°
170°
117°
149°
June
218°
284°
162°
129°
July
233°
200°
178°
216°
August
223°
161°
191°
083°
September
068°
028°
102°
062°
October
062°
091°
096°
046°
November
039°
048°
058°
044°
December
044°
099°
170°
123°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.