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
90.6
93
92
98
85
91
February
94.7
87
98
92
98
98
March
90.7
87
92
95
90
93
April
93.4
95
97
97
94
May
96.2
97
96
97
99
June
94.2
96
95
95
86
July
93.6
94
95
90
88
August
92.3
90
98
88
79
September
93.2
87
93
90
97
October
94.6
95
97
98
91
November
92.4
92
95
87
94
December
89.1
93
85
90
88
Average
92.7
88.7
93.4
95.1
92.3
91.1
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.