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
84.5
80
80
94
89
85
February
88.6
86
87
95
93
82
March
90.7
92
98
93
87
95
April
96.2
94
99
98
100
May
95.6
96
100
91
95
June
95.5
97
97
96
96
July
92.2
89
98
100
96
August
92.8
95
87
90
95
September
92.7
87
93
92
98
October
92.0
89
93
93
95
November
88.4
95
88
85
96
December
86.9
79
90
89
89
Average
91.0
86.1
90.7
93.9
92.1
93.6
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.