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
99.6
100
100
100
100
100
February
98.7
100
98
97
98
100
March
99.2
97
100
100
100
99
April
97.0
87
100
100
99
May
98.2
100
96
100
94
June
98.9
100
97
100
99
July
96.4
100
100
84
94
August
97.2
99
97
99
98
September
99.1
100
100
100
100
October
98.1
99
91
100
99
November
99.4
100
100
99
99
December
99.1
100
100
97
98
Average
98.4
98.9
98.4
97.9
97.8
98.0
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.