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
January
90.7
90
89
93
February
88.6
94
83
89
March
89.0
83
92
92
April
92.5
91
95
May
93.3
93
94
June
96.7
98
96
July
95.5
96
95
August
95.1
98
92
September
96.6
98
95
October
96.3
96
97
96
November
88.9
83
88
97
December
80.1
91
70
75
Average
90.4
88.7
92.7
92.2
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
January
16.9
16
19
16
February
20.2
20
22
19
March
23.0
22
23
24
April
25.1
25
25
May
29.1
29
30
June
32.5
32
33
July
32.4
33
32
August
33.1
36
31
September
31.1
32
31
October
25.5
26
26
25
November
20.3
20
21
20
December
19.5
17
19
22
Average
23.2
19.2
26.1
25.7
21.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
4.7
4
8
3
February
8.9
8
11
8
March
11.0
11
12
10
April
13.5
14
13
May
17.7
17
18
June
21.4
21
22
July
22.5
22
23
August
22.4
23
23
September
19.8
21
19
October
13.3
14
12
15
November
9.0
9
11
7
December
9.6
7
11
12
Average
11.9
7.5
14.8
14.5
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
2.8
4
3
2
February
1.9
1
4
1
March
2.4
4
2
2
April
1.9
3
1
May
1.0
1
1
June
1.2
1
1
July
1.8
2
2
August
2.8
1
5
September
0.9
1
1
October
1.2
3
1
0
November
1.7
4
1
0
December
1.4
1
2
2
Average
1.8
2.9
2.0
1.5
0.8
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
January
6.5
7
6
7
February
7.0
7
7
8
March
6.6
7
6
7
April
6.8
7
7
May
5.0
5
5
June
4.5
5
4
July
3.6
4
3
August
3.9
5
3
September
4.9
5
5
October
5.6
6
5
6
November
5.5
6
6
5
December
5.7
6
5
6
Average
5.7
6.6
5.5
5.3
5.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
002°
252°
330°
February
268°
192°
068°
March
028°
216°
211°
April
105°
175°
May
023°
174°
June
244°
324°
July
294°
178°
August
289°
151°
September
057°
021°
October
012°
011°
301°
November
029°
024°
009°
December
027°
021°
207°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.