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
86.0
88
93
88
94
80
February
95.5
98
96
94
94
99
March
97.3
100
93
98
98
100
April
98.7
99
99
100
99
May
99.1
98
100
100
99
June
99.5
100
98
100
100
July
98.8
100
100
97
100
August
95.8
98
100
92
83
September
95.7
99
99
100
73
October
94.4
95
100
82
87
November
88.6
97
95
83
97
December
85.3
86
71
85
Average
95.0
95.1
96.4
97.6
92.9
91.9
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
14.1
15
14
15
15
13
February
16.6
17
15
19
18
20
March
18.7
18
15
23
19
19
April
23.8
24
25
26
24
May
28.6
27
30
31
30
June
33.9
31
35
35
34
July
36.6
37
36
38
36
August
35.9
36
37
36
36
September
32.5
30
34
34
34
October
26.6
28
29
21
30
November
18.6
20
16
18
18
December
14.1
16
11
15
Average
24.2
16.5
24.8
27.6
25.1
25.7
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
5.2
8
6
3
5
5
February
4.8
8
3
3
6
5
March
7.0
8
6
7
6
6
April
9.0
9
8
8
10
May
12.1
12
12
13
13
June
15.5
14
16
16
16
July
16.5
17
17
18
14
August
16.4
14
17
16
18
September
14.5
14
17
15
14
October
9.5
10
11
8
11
November
6.1
7
5
8
4
December
4.2
6
5
3
Average
9.8
7.7
9.9
10.7
10.2
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.8
14
12
1
5
5
February
8.0
11
16
0
3
0
March
8.6
9
20
3
3
8
April
3.8
1
5
1
3
May
3.6
9
1
0
5
June
2.3
6
2
0
0
July
0.1
0
0
0
0
August
0.3
2
0
0
0
September
0.7
2
2
0
0
October
1.2
3
0
0
0
November
5.5
7
1
2
4
December
8.1
7
11
9
Average
4.8
11.0
6.4
1.3
1.9
2.7
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
6.6
7
9
5
7
6
February
7.5
8
8
6
7
7
March
7.5
8
9
7
8
8
April
6.9
6
9
6
6
May
7.1
7
9
8
7
June
6.4
6
7
6
6
July
5.1
5
6
6
5
August
4.8
5
5
5
5
September
5.4
5
5
5
5
October
5.7
5
4
6
5
November
5.2
6
7
4
5
December
5.5
5
7
5
Average
6.3
7.4
6.2
6.2
6.1
5.8
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
160°
256°
324°
161°
163°
February
169°
187°
328°
316°
331°
March
173°
187°
260°
302°
175°
April
223°
204°
168°
178°
May
167°
302°
286°
183°
June
170°
177°
170°
193°
July
177°
171°
176°
175°
August
205°
175°
174°
183°
September
173°
172°
209°
319°
October
323°
315°
211°
324°
November
313°
183°
299°
296°
December
154°
171°
334°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.