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
84.9
90
94
95
61
88
February
88.2
85
90
94
89
99
March
94.2
93
96
92
97
90
April
98.4
100
97
99
99
97
May
99.2
98
99
99
100
June
99.4
99
100
99
100
July
99.8
100
100
100
100
August
99.6
100
100
100
100
September
98.4
98
97
99
99
October
98.0
98
98
97
97
November
92.2
100
97
93
82
December
85.4
95
77
96
75
Average
95.3
92.4
97.1
96.7
95.0
94.8
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.