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
January
71.7
75
55
79
February
79.2
76
69
88
March
82.2
76
79
93
April
78.3
76
82
May
90.9
93
89
June
98.7
98
100
July
100.0
100
100
August
90.5
94
87
September
97.1
100
94
October
86.9
84
91
November
64.1
76
55
December
66.0
83
33
Average
81.2
75.5
85.0
83.3
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
January
11.0
8
13
12
February
12.0
14
13
9
March
17.0
18
19
14
April
21.0
20
22
May
25.3
25
26
June
28.1
29
28
July
28.6
29
28
August
27.1
28
27
September
25.9
27
25
October
20.4
21
20
November
15.8
16
15
December
13.5
12
17
Average
18.2
13.1
21.0
20.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
8.7
7
12
7
February
11.4
14
13
8
March
16.3
17
18
14
April
20.4
19
22
May
23.8
23
25
June
25.9
26
26
July
27.1
27
27
August
26.2
27
26
September
24.3
26
23
October
19.6
20
19
November
14.2
15
14
December
12.9
12
16
Average
17.1
12.7
19.7
19.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
10.4
8
13
11
February
2.5
7
0
0
March
12.5
15
18
3
April
4.0
5
3
May
1.2
0
3
June
0.0
0
0
July
0.0
0
0
August
13.5
11
15
September
2.8
0
6
October
14.4
14
16
November
26.0
22
29
December
15.0
11
22
Average
9.1
10.2
7.9
9.3
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
January
4.5
5
4
5
February
4.4
3
4
6
March
5.5
5
6
6
April
7.3
7
7
May
8.0
6
10
June
8.3
8
9
July
9.3
8
10
August
7.9
7
8
September
4.4
5
4
October
4.6
6
3
November
4.3
4
5
December
2.9
3
3
Average
5.5
4.2
5.8
6.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
353°
010°
011°
February
048°
094°
053°
March
121°
083°
142°
April
068°
132°
May
134°
142°
June
151°
147°
July
147°
146°
August
129°
129°
September
136°
120°
October
090°
073°
November
095°
007°
December
136°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.