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
76.2
75
67
February
93.4
96
100
100
95
March
95.8
99
95
April
97.0
96
May
96.6
97
June
98.6
100
July
94.8
100
100
August
98.2
0
100
September
98.9
October
95.3
November
82.3
97
December
77.1
87
Average
93.0
89.4
91.2
98.5
100.0
89.2
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
14.9
15
15
February
17.0
17
14
20
19
March
20.2
20
20
April
24.6
24
May
28.0
29
June
34.4
34
July
36.0
40
40
August
36.7
24
38
September
32.8
October
26.2
November
19.9
19
December
15.2
17
Average
24.2
17.6
20.0
20.2
38.5
21.0
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
4.6
5
3
February
3.6
6
4
4
2
March
4.8
8
6
April
6.7
6
May
8.6
10
June
12.8
19
July
13.1
25
28
August
12.6
20
21
September
10.4
October
4.1
November
4.0
4
December
2.7
4
Average
8.1
6.4
6.3
4.3
21.6
4.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
February
0.0
0
0
0
0
March
0.0
0
0
April
0.0
0
May
0.0
0
June
0.0
0
July
0.0
0
0
August
0.0
0
0
September
0.0
October
0.0
November
0.0
0
December
0.0
0
Average
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
2.8
4
3
February
4.3
4
4
4
3
March
5.0
6
3
April
5.8
6
May
5.6
6
June
5.7
5
July
4.6
4
4
August
4.3
0
4
September
4.2
October
3.6
November
3.1
3
December
3.0
3
Average
4.2
4.6
3.3
3.7
4.3
4.3
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
138°
293°
February
175°
140°
296°
293°
March
276°
120°
April
300°
May
309°
June
276°
July
233°
270°
August
360°
292°
September
October
November
278°
December
142°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.