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
96.5
99
95
95
97
93
February
94.0
87
97
95
96
90
March
93.1
86
99
86
95
90
April
90.8
85
93
88
92
97
May
88.6
95
83
77
84
June
87.6
80
83
93
92
July
90.9
90
89
92
95
August
87.8
84
88
94
87
September
89.2
84
93
87
92
October
93.6
95
97
98
96
November
93.4
90
97
94
92
December
95.2
92
99
95
90
Average
92.2
89.8
91.9
91.8
93.1
91.4
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.