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
93.6
99
99
97
97
88
February
96.7
97
100
98
98
90
March
95.8
97
93
98
89
95
April
97.1
98
100
99
93
92
May
98.1
100
99
99
99
June
95.7
100
96
97
88
July
93.8
95
100
92
96
August
90.8
92
98
89
79
September
94.9
94
96
97
87
October
95.4
99
97
100
95
November
92.2
93
93
85
91
December
95.3
98
93
97
99
Average
95.3
97.7
96.7
97.3
94.5
91.5
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.