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
99.7
100
100
100
99
100
February
96.4
94
99
97
97
March
91.9
96
97
100
84
91
April
98.7
99
94
100
100
May
99.5
99
99
100
100
June
98.4
98
100
99
97
July
99.7
99
100
100
100
August
99.0
99
99
99
99
September
99.2
100
97
99
100
October
98.8
94
100
100
100
November
99.5
99
100
99
100
December
99.5
100
100
99
99
Average
98.4
96.6
98.5
99.1
98.1
98.3
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.