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
78.6
86
80
82
77
75
February
82.6
84
85
92
88
81
March
86.2
80
84
85
92
89
April
92.2
91
91
90
95
May
95.7
99
98
91
98
June
97.4
99
93
100
95
July
98.4
99
100
95
99
August
93.2
96
96
88
95
September
92.4
95
98
87
90
October
80.6
88
87
80
75
November
74.0
77
68
61
76
December
77.9
79
81
81
82
Average
89.0
82.6
92.0
91.7
88.2
90.1
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.