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
82.0
76
100
99
96
51
February
87.8
98
86
85
80
90
March
93.0
100
100
95
100
100
April
94.7
100
100
100
90
May
99.9
100
100
100
100
June
99.0
99
99
99
99
July
98.3
99
100
98
98
August
97.1
98
99
97
98
September
94.3
95
92
97
92
October
96.4
98
98
99
99
November
93.1
92
99
97
99
December
88.7
94
96
92
96
Average
92.8
91.5
96.6
97.0
96.4
92.8
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.