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
97.4
98
99
94
98
97
February
94.0
95
95
98
90
93
March
96.6
93
98
100
98
95
April
95.6
99
98
94
87
May
97.2
99
98
97
98
June
98.4
99
99
99
98
July
98.9
100
99
99
99
August
98.1
99
98
99
97
September
97.7
96
98
98
99
October
96.1
94
96
96
97
November
94.8
94
95
99
96
December
93.1
94
85
93
86
Average
96.6
95.2
97.3
97.2
96.9
95.2
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.