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
97.6
96
98
95
98
98
February
96.8
93
91
99
98
97
March
93.3
83
94
91
99
95
April
89.6
84
81
96
92
May
91.1
87
90
94
91
June
94.3
94
97
93
95
July
93.1
91
95
92
95
August
94.6
97
90
98
91
September
94.3
96
96
99
90
October
92.1
93
88
89
November
93.6
98
90
94
December
94.9
91
89
94
Average
93.7
90.9
92.8
91.6
96.1
93.3
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.