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
94.6
95
96
89
99
90
February
93.4
93
95
97
89
91
March
96.6
100
94
96
97
April
97.2
100
97
98
96
May
96.8
98
97
97
99
June
97.6
98
100
97
99
July
97.7
100
97
97
98
August
99.0
100
100
98
99
September
98.1
97
100
95
98
October
98.7
97
98
100
98
November
97.6
99
98
96
96
December
94.1
94
96
93
95
Average
96.6
94.0
97.8
96.9
96.2
96.6
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.