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
85.6
81
87
79
94
83
February
76.0
67
63
86
79
77
March
90.9
82
93
98
96
92
April
97.1
99
96
95
100
May
97.6
98
99
95
100
June
98.7
99
99
100
99
July
99.3
99
100
99
100
August
99.8
100
100
100
100
September
98.5
100
99
99
100
October
88.9
90
96
95
83
November
89.5
95
92
82
92
December
87.3
84
88
89
84
Average
91.7
77.1
93.6
95.4
94.7
92.7
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.