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
79.3
87
88
75
88
67
February
82.3
81
84
90
82
88
March
87.4
85
85
96
86
92
April
92.5
90
97
96
97
May
92.7
88
97
98
100
June
93.4
99
98
86
97
July
94.1
92
99
90
90
August
95.9
95
99
95
93
September
93.6
92
98
93
92
October
91.7
92
94
88
96
November
84.2
88
82
85
79
December
77.8
77
80
67
82
Average
89.4
84.5
89.9
93.9
89.0
90.7
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.