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
89
84
76
85
69
February
85.9
83
84
91
85
91
March
91.7
91
91
98
95
91
April
93.8
90
96
95
96
May
95.0
90
96
97
100
June
94.8
95
94
91
97
July
95.1
91
97
92
94
August
96.5
94
99
94
97
September
91.7
95
76
97
93
October
87.1
91
55
93
94
November
83.2
82
88
83
84
December
78.3
81
80
69
86
Average
90.4
88.1
89.7
88.9
91.0
92.3
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.