Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
92.3
94
86
98
February
93.3
89
97
95
100
March
96.7
96
100
94
0
April
98.4
100
98
0
100
May
99.3
99
99
100
June
99.1
99
100
July
99.6
100
100
August
100.0
100
100
September
98.9
99
99
October
98.5
97
100
0
November
95.9
96
97
0
December
83.2
96
66
0
Average
53.5
92.9
97.7
96.9
28.5
33.3
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.