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
94.3
96
92
93
93
90
February
92.3
84
93
97
97
95
March
89.9
86
87
91
95
85
April
91.3
93
81
96
89
May
89.5
90
84
91
86
June
87.7
90
89
94
80
July
87.3
97
90
80
85
August
91.7
98
87
88
98
September
88.5
88
90
83
88
October
84.8
92
89
88
82
November
92.1
93
90
96
95
December
93.6
91
93
96
92
Average
90.0
88.1
92.1
89.0
91.2
88.4
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.