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
84.0
84
87
80
88
93
February
86.6
84
77
87
82
88
March
89.2
91
80
91
91
90
April
95.0
95
98
95
97
May
96.3
93
95
99
97
June
99.4
97
100
99
100
July
99.4
99
100
99
99
August
99.4
98
100
99
100
September
99.3
100
100
100
99
October
97.4
93
96
99
99
November
95.2
95
92
94
97
December
89.6
85
98
85
99
Average
93.9
86.5
92.2
95.2
95.0
96.5
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.