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
94.3
93
100
91
93
98
February
96.1
96
93
95
99
97
March
96.0
96
93
98
94
99
April
96.9
97
98
98
94
May
93.9
90
99
94
98
June
93.1
93
85
95
92
July
94.1
93
97
91
100
August
95.1
88
95
99
91
September
97.7
99
98
96
95
October
99.1
100
98
98
99
November
98.9
100
100
99
96
December
95.7
92
97
96
100
Average
95.5
95.0
93.8
95.4
95.7
96.1
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.