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
95.2
97
93
98
90
96
February
95.9
96
92
96
98
98
March
95.9
99
95
92
97
94
April
95.0
97
97
95
95
May
92.7
89
92
97
91
June
93.5
97
95
98
91
July
94.7
99
99
100
75
August
93.0
100
97
93
80
September
88.3
97
92
88
75
October
93.1
93
97
97
79
November
95.1
87
97
95
97
December
97.0
98
100
97
97
Average
94.5
97.3
94.8
95.7
95.2
88.9
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.