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
93.7
97
90
91
98
95
February
93.7
95
92
94
98
88
March
96.7
95
96
96
96
100
April
97.0
95
99
99
99
May
94.9
97
92
96
96
June
95.6
90
95
92
97
July
98.3
98
100
98
98
August
97.0
99
95
99
98
September
96.8
98
93
100
99
October
96.6
97
97
99
99
November
96.9
98
100
96
99
December
95.8
99
90
94
96
Average
96.0
95.6
95.6
95.3
97.1
96.7
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.