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
88.3
89
86
81
93
91
February
85.8
90
83
89
83
76
March
90.0
85
90
92
91
94
April
91.7
87
91
96
98
May
87.8
86
92
85
89
June
86.0
84
85
90
88
July
90.7
90
94
88
93
August
89.4
93
94
91
87
September
89.9
97
86
93
89
October
90.1
86
91
90
90
November
90.9
92
91
91
91
December
91.0
95
86
94
84
Average
89.1
87.7
88.9
89.1
90.3
88.9
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.