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
89.0
90
81
92
93
92
February
86.3
75
89
92
87
81
March
83.6
82
85
85
76
93
April
89.1
83
79
89
96
97
May
90.1
86
100
85
86
June
88.7
87
97
82
81
July
87.0
79
90
88
84
August
92.9
93
89
96
89
September
94.6
87
97
96
96
October
96.7
96
96
98
98
November
94.1
97
95
91
95
December
88.9
75
88
88
90
Average
89.7
82.1
85.8
92.3
89.5
90.1
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.