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
84.5
89
94
73
86
82
February
88.9
80
91
91
88
96
March
91.9
95
95
89
95
94
April
90.1
88
88
97
87
May
89.9
88
90
96
93
June
87.3
87
95
76
91
July
93.9
96
97
87
93
August
93.3
94
93
95
91
September
92.0
95
95
91
85
October
87.7
92
87
91
93
November
88.7
92
92
90
89
December
83.7
88
73
74
90
Average
89.6
88.5
91.6
90.0
89.1
90.5
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.