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
96.2
93
100
100
99
87
February
93.0
98
96
97
81
91
March
97.3
100
100
96
100
100
April
98.8
100
100
100
96
May
98.8
100
99
99
97
June
94.6
100
97
91
83
July
99.2
100
100
99
98
August
99.7
100
100
100
100
September
99.7
100
100
100
100
October
99.4
100
100
99
100
November
99.2
100
99
100
100
December
96.6
95
100
99
100
Average
97.8
97.2
99.2
98.9
97.5
95.8
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.