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
84.2
81
89
76
89
84
February
87.4
89
89
85
93
83
March
82.6
84
83
84
83
85
April
83.8
85
83
86
94
May
92.0
99
93
93
95
June
91.1
99
86
91
96
July
94.2
93
99
94
89
August
88.9
87
88
96
77
September
89.5
88
97
95
78
October
91.5
90
93
93
85
November
94.3
91
97
94
99
December
90.5
94
94
98
94
Average
88.3
84.7
90.1
89.1
92.2
88.6
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.