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
91.5
80
100
98
95
73
February
81.8
79
92
87
70
86
March
91.4
99
94
83
91
99
April
97.7
95
95
99
100
May
97.3
96
97
98
99
June
93.6
100
92
96
81
July
99.2
98
98
100
100
August
97.3
98
96
95
97
September
95.5
98
95
97
90
October
95.4
99
99
91
96
November
97.3
95
96
96
99
December
91.6
81
100
89
100
Average
90.3
86.2
95.4
94.5
93.3
93.2
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.