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
79.7
78
74
95
82
65
February
76.1
84
74
76
72
76
March
87.5
82
88
85
89
81
April
90.7
87
92
88
92
May
89.7
89
90
89
92
June
88.0
73
93
89
93
July
91.4
94
91
93
89
August
90.1
93
83
94
95
September
90.4
96
95
85
86
October
87.2
88
96
89
83
November
83.7
78
78
89
89
December
79.0
76
73
80
87
Average
85.7
81.2
84.1
87.0
86.9
85.7
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
15
19
17
16
16
February
19.6
20
21
17
15
18
March
22.7
22
23
22
23
25
April
25.0
24
27
25
25
May
29.3
29
31
27
28
June
32.4
34
35
32
32
July
33.6
36
35
33
33
August
33.6
38
33
34
34
September
31.5
34
31
31
29
October
26.9
28
26
28
26
November
20.5
19
21
20
23
December
18.6
18
20
23
17
Average
25.0
19.0
26.7
26.3
25.6
25.3
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
5.8
4
9
4
6
8
February
7.7
9
10
5
5
7
March
11.3
11
12
9
12
15
April
13.5
14
14
13
14
May
18.5
17
20
18
18
June
21.8
21
23
21
22
July
23.6
25
25
23
24
August
22.7
25
24
23
19
September
20.0
21
18
20
19
October
15.0
15
12
16
15
November
8.8
9
10
8
11
December
7.9
7
12
13
6
Average
13.8
8.0
15.1
14.5
14.7
14.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.4
15
25
3
34
18
February
13.5
16
23
6
12
20
March
6.3
15
6
7
4
10
April
4.7
6
6
5
8
May
7.5
22
4
7
10
June
4.4
3
2
4
7
July
6.1
5
9
5
7
August
5.4
0
11
2
3
September
8.6
3
3
8
11
October
8.3
11
6
4
8
November
15.8
8
16
16
42
December
14.6
13
18
9
22
Average
9.6
15.3
10.5
7.3
8.6
13.2
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
2.6
2
2
3
2
2
February
2.8
2
2
3
3
3
March
2.8
2
3
3
3
3
April
2.8
2
3
3
2
May
2.3
2
3
2
2
June
2.2
2
2
2
2
July
1.9
2
2
1
2
August
1.8
2
2
2
2
September
1.8
2
2
2
2
October
2.1
2
2
2
2
November
2.0
2
2
2
2
December
2.0
2
2
2
2
Average
2.3
2.3
2.1
2.3
2.0
2.2
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
132°
198°
318°
274°
055°
February
202°
218°
072°
012°
324°
March
129°
201°
171°
063°
125°
April
058°
169°
116°
077°
May
081°
189°
126°
104°
June
200°
084°
153°
075°
July
208°
210°
182°
148°
August
176°
157°
059°
270°
September
057°
045°
069°
004°
October
040°
195°
130°
030°
November
018°
059°
045°
040°
December
138°
113°
199°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.