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
97.2
94
98
97
95
98
February
97.9
97
98
100
97
100
March
96.2
99
93
92
94
96
April
96.1
100
97
100
94
May
95.6
96
94
95
95
June
96.7
97
94
99
90
July
97.5
99
95
97
100
August
96.7
99
99
98
99
September
98.5
96
100
98
99
October
97.6
97
98
100
99
November
94.6
88
89
97
96
December
97.0
91
97
99
100
Average
96.8
96.8
96.1
95.7
97.2
97.0
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.