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
89.7
94
97
91
88
88
February
95.4
96
99
93
94
88
March
96.7
97
99
96
96
97
April
90.3
100
77
98
97
53
May
94.6
87
99
99
96
June
96.9
98
99
99
86
July
98.5
98
98
99
99
August
97.1
98
97
99
93
September
96.9
98
97
97
94
October
93.3
90
93
96
98
November
89.6
87
97
87
85
December
91.3
90
99
98
90
Average
94.3
96.6
93.0
96.2
95.7
90.0
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.