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
93.8
100
99
87
96
100
February
95.3
100
93
95
96
95
March
91.8
98
97
81
85
95
April
92.7
91
95
95
94
May
97.0
99
94
100
98
June
97.6
100
99
96
100
July
98.8
100
99
98
99
August
98.7
100
98
98
100
September
99.2
100
96
99
100
October
99.7
100
100
100
100
November
99.6
100
100
100
100
December
99.0
100
99
98
100
Average
97.0
99.3
98.1
95.0
96.8
98.3
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.