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
95.9
96
100
96
97
95
February
97.6
95
99
94
98
99
March
97.9
93
98
99
99
99
April
92.5
79
98
97
76
May
97.3
90
99
97
98
June
99.0
98
98
100
99
July
99.2
100
100
100
99
August
99.2
100
100
99
100
September
99.1
100
98
99
99
October
97.9
99
97
99
100
November
94.5
91
98
95
77
December
95.4
94
98
100
67
Average
96.9
94.6
95.4
97.9
98.1
96.0
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.