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
83.4
98
81
91
89
84
February
93.7
97
97
96
93
97
March
97.4
99
98
100
96
99
April
98.1
97
97
100
99
May
98.0
97
100
99
98
June
97.4
97
99
99
95
July
99.3
100
99
100
99
August
98.4
99
98
98
98
September
98.8
98
97
100
100
October
96.7
100
96
92
95
November
89.2
90
85
92
76
December
87.5
94
98
84
88
Average
95.8
98.1
96.1
96.6
96.0
94.7
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.