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
98.1
99
98
99
97
97
February
96.3
95
98
90
95
100
March
95.5
97
96
95
94
99
April
94.8
89
97
98
100
May
89.0
80
84
92
94
June
88.2
95
76
90
92
July
93.0
97
98
97
94
August
95.3
97
98
86
96
September
91.7
92
95
96
85
October
91.9
96
86
99
95
November
95.9
91
99
93
97
December
97.3
95
99
98
97
Average
94.4
97.0
93.7
93.0
94.4
95.5
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.