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
86.9
86
84
85
83
88
February
78.6
83
76
86
70
72
March
85.9
80
84
78
85
89
April
90.7
92
83
93
90
96
May
93.3
92
88
93
96
June
94.7
94
99
92
95
July
95.5
93
93
94
98
August
95.4
99
96
91
95
September
94.1
94
94
89
88
October
92.9
93
94
95
90
November
90.2
86
87
97
90
December
79.4
89
78
62
89
Average
89.7
85.1
89.3
89.9
87.3
90.9
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
17.9
17
21
17
17
19
February
21.0
20
23
20
18
20
March
23.1
24
24
23
22
25
April
25.4
26
26
25
24
26
May
29.3
29
29
28
30
June
31.3
31
32
31
32
July
31.9
33
31
31
32
August
32.2
35
31
31
32
September
31.1
31
31
30
30
October
27.7
27
28
27
28
November
22.5
22
23
21
25
December
19.3
18
22
22
18
Average
25.6
21.7
26.8
26.0
25.2
26.3
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
10.5
9
13
8
8
10
March
11.9
12
14
11
12
15
April
13.9
14
15
14
13
15
May
17.9
18
19
17
17
June
22.5
22
23
22
22
July
23.4
25
23
22
24
August
23.5
25
23
23
24
September
21.7
21
21
21
22
October
16.2
15
13
17
19
November
10.4
10
12
8
14
December
9.1
9
12
12
4
Average
15.1
10.2
16.3
15.3
15.2
16.2
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
6
5
10
12
5
February
5.6
10
7
4
6
5
March
3.9
10
2
5
4
2
April
3.5
2
5
3
7
3
May
3.4
3
5
2
2
June
5.3
5
2
4
4
July
5.4
4
9
5
7
August
6.1
2
8
9
7
September
6.6
4
5
11
16
October
4.5
2
3
8
4
November
4.2
9
5
3
3
December
6.3
10
1
1
6
Average
5.2
6.8
4.6
5.3
5.9
5.2
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
7.8
8
7
8
7
8
February
8.2
8
9
8
8
8
March
8.5
8
9
9
9
8
April
8.4
9
8
8
8
8
May
7.2
6
7
8
8
June
6.6
8
6
7
7
July
5.6
6
5
6
6
August
5.9
7
5
6
6
September
6.2
6
7
5
8
October
7.0
7
6
6
7
November
7.0
7
8
6
8
December
7.1
8
6
7
7
Average
7.2
8.1
7.3
6.8
6.9
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
357°
214°
324°
252°
056°
February
183°
171°
093°
002°
153°
March
104°
172°
163°
136°
176°
April
174°
169°
164°
166°
218°
May
179°
168°
134°
181°
June
217°
228°
166°
170°
July
230°
196°
190°
217°
August
231°
182°
135°
175°
September
059°
014°
088°
046°
October
007°
015°
339°
037°
November
009°
360°
355°
018°
December
005°
046°
159°
344°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.