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
89.1
88
78
80
98
84
February
87.6
88
97
77
85
87
March
95.5
98
100
100
96
89
April
98.3
96
99
100
99
May
98.6
100
96
100
98
June
99.5
98
100
100
100
July
99.7
100
100
100
99
August
98.6
97
100
100
97
September
98.3
100
96
99
100
October
95.5
96
97
94
91
November
91.9
97
92
84
95
December
88.6
96
80
85
95
Average
94.4
90.9
95.8
92.9
94.7
94.0
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.