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
72.1
71
80
77
73
69
February
85.7
86
88
92
95
90
March
88.0
90
90
89
85
90
April
93.1
94
94
93
97
May
94.6
91
99
96
95
June
93.6
96
86
96
90
July
93.6
96
93
95
91
August
93.9
95
90
89
92
September
94.8
94
94
93
98
October
92.7
97
92
84
92
November
87.1
87
76
84
92
December
76.9
77
86
78
71
Average
88.4
82.2
90.7
89.4
88.9
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.