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
88.3
91
91
86
94
92
February
93.0
97
92
99
96
99
March
96.1
98
99
97
91
99
April
97.7
97
97
97
100
May
98.5
97
98
100
98
June
98.8
100
100
100
97
July
99.3
99
100
98
100
August
98.7
98
99
99
98
September
97.9
100
98
100
97
October
96.7
99
97
96
99
November
86.4
99
95
76
83
December
88.4
94
70
85
81
Average
95.8
95.3
97.3
96.2
95.5
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.