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
85.9
88
91
90
73
81
February
91.9
91
99
94
90
87
March
94.8
97
94
94
99
90
April
94.6
92
93
97
97
May
93.2
98
93
92
92
June
92.1
91
97
91
90
July
87.4
92
86
85
90
August
84.1
90
81
82
82
September
89.7
96
95
95
95
October
88.7
90
87
86
89
November
88.4
78
84
96
95
December
85.6
90
89
82
85
Average
89.9
92.2
92.0
90.3
89.2
89.3
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.