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
95.2
97
97
98
85
97
February
94.5
91
98
99
94
94
March
93.8
93
91
94
98
97
April
97.5
97
99
99
98
98
May
98.4
98
99
100
98
June
98.6
100
99
99
100
July
97.0
99
99
98
95
August
98.0
99
97
97
99
September
97.6
98
98
99
98
October
97.2
98
97
99
98
November
94.1
99
90
93
97
December
92.0
94
86
90
96
Average
96.2
94.7
97.4
96.9
96.3
97.2
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.