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
96.2
98
99
97
90
96
February
96.1
94
99
97
94
97
March
96.8
100
99
88
97
100
April
97.8
97
94
99
99
May
96.9
98
91
96
98
June
96.3
98
100
96
95
July
95.6
95
90
97
93
August
99.1
98
100
100
98
September
99.4
100
100
100
97
October
98.4
100
97
100
99
November
98.3
99
100
92
100
December
97.7
99
100
100
96
Average
97.3
97.0
98.6
95.7
96.5
97.4
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.