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
95.0
92
89
91
100
95
February
97.0
99
98
96
96
94
March
97.2
90
100
97
99
95
April
98.5
98
98
98
100
May
97.2
97
100
99
98
June
97.7
99
96
98
100
July
98.3
97
99
99
98
August
95.1
89
97
95
99
September
94.7
95
94
92
96
October
94.1
90
99
88
95
November
93.2
96
93
91
95
December
96.0
99
93
98
93
Average
95.9
93.5
95.5
96.1
95.9
96.0
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.