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
94.8
99
88
90
100
97
February
96.2
99
95
97
98
97
March
96.9
99
98
94
97
99
April
98.0
100
97
100
98
May
97.0
99
86
100
99
June
99.4
100
97
100
100
July
99.7
100
100
100
100
August
100.0
100
100
100
100
September
100.0
100
100
100
100
October
98.6
100
100
100
100
November
96.2
97
97
96
84
December
96.3
100
89
99
92
Average
98.0
98.9
98.2
95.7
99.1
97.9
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.