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
98.9
100
99
99
99
99
February
99.3
100
100
100
100
100
March
99.5
99
100
100
99
100
April
91.8
99
81
99
100
73
May
96.6
96
100
99
95
June
98.5
99
99
99
96
July
98.8
100
100
99
98
August
97.1
98
97
97
97
September
97.7
99
96
97
99
October
98.1
99
98
97
99
November
96.4
100
97
99
93
December
97.2
99
93
99
97
Average
97.6
99.1
97.4
98.3
98.6
95.4
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.