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
83.3
76
80
88
85
81
February
77.9
92
83
84
66
82
March
88.4
87
93
94
91
81
April
89.9
90
89
88
May
91.5
98
91
88
95
June
92.4
91
97
90
94
July
91.9
80
98
92
94
August
93.3
85
98
94
97
September
93.1
99
97
94
88
October
89.0
93
96
91
84
November
85.8
81
86
87
84
December
86.3
94
81
86
86
Average
88.3
84.8
88.0
92.3
88.1
88.1
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
18.0
16
20
18
18
19
February
19.6
22
21
17
15
19
March
24.0
24
24
23
24
25
April
26.6
28
25
26
May
30.5
31
33
29
30
June
33.8
35
36
33
33
July
35.4
37
38
33
35
August
35.9
39
36
34
36
September
32.9
36
34
33
30
October
28.1
29
29
29
28
November
22.1
21
21
23
25
December
19.8
20
21
24
19
Average
26.5
20.7
28.3
28.1
26.6
27.1
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
6.7
5
9
5
7
9
February
9.0
11
10
4
5
8
March
12.9
14
14
9
12
16
April
15.3
17
15
15
May
19.5
21
22
19
18
June
23.3
25
23
24
22
July
22.5
11
25
24
25
August
22.1
15
23
24
23
September
21.0
24
21
21
21
October
14.3
17
15
16
16
November
10.5
11
10
9
12
December
8.8
8
13
14
6
Average
14.8
9.9
14.5
15.8
15.8
16.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
8
7
5
5
8
February
6.3
2
5
6
5
7
March
4.3
3
3
5
5
6
April
2.7
1
6
5
May
1.9
2
0
5
1
June
2.9
1
1
4
4
July
1.8
1
1
6
2
August
2.4
0
2
1
1
September
3.1
1
1
2
8
October
3.8
5
2
4
3
November
6.1
5
11
4
5
December
5.5
2
6
2
6
Average
3.8
4.0
2.7
3.1
4.1
4.2
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
7.1
8
7
7
7
7
February
7.5
8
8
8
7
7
March
7.3
6
8
8
8
7
April
7.8
9
7
7
May
7.0
4
8
7
7
June
5.9
6
6
5
6
July
5.2
4
6
5
6
August
5.3
5
5
5
5
September
4.7
4
4
4
6
October
5.8
7
5
5
5
November
5.6
5
5
5
5
December
6.5
6
6
7
6
Average
6.4
7.2
5.9
6.3
6.0
6.1
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
327°
318°
325°
314°
134°
February
258°
263°
332°
331°
302°
March
150°
168°
215°
127°
158°
April
160°
123°
123°
May
106°
169°
137°
163°
June
184°
171°
156°
155°
July
195°
185°
167°
168°
August
178°
170°
169°
180°
September
147°
097°
094°
012°
October
085°
171°
207°
011°
November
354°
047°
252°
094°
December
336°
193°
193°
274°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.