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
89.4
93
100
99
98
80
February
84.5
92
100
99
98
71
March
86.6
93
85
97
100
98
April
92.0
97
91
96
99
91
May
93.1
98
95
96
95
June
92.2
93
97
97
96
July
91.4
96
87
95
94
August
91.1
99
90
96
93
September
91.9
97
90
96
91
October
93.8
98
99
98
88
November
95.8
99
98
98
98
December
96.3
100
100
100
99
Average
91.9
93.8
96.4
95.7
97.5
90.2
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.