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
89.4
95
98
95
62
97
February
95.8
95
100
95
99
92
March
89.9
96
98
88
93
69
April
91.0
96
97
99
99
May
90.1
97
99
99
99
June
90.6
97
100
100
89
July
97.5
99
96
100
89
August
99.8
100
100
100
100
September
98.5
100
94
100
99
October
97.0
97
94
95
98
November
97.2
94
100
95
99
December
89.1
97
94
98
80
Average
93.8
95.3
97.6
95.7
94.4
92.2
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.