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
94
96
98
100
99
February
97.3
97
96
99
95
100
March
96.9
97
95
100
95
100
April
96.5
96
96
99
100
May
98.2
96
99
99
June
94.9
96
97
99
100
July
94.2
92
98
96
100
August
92.3
90
95
93
100
September
95.1
94
98
98
100
October
95.7
93
97
97
83
November
96.6
96
99
97
95
December
96.9
96
96
97
92
Average
95.9
95.7
94.6
97.5
96.7
97.7
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.