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
87.3
92
88
88
87
88
February
87.1
92
90
88
87
84
March
85.6
90
88
86
85
83
April
85.6
88
86
85
85
May
86.4
93
89
87
86
June
87.8
90
92
87
88
July
82.9
89
93
84
86
August
85.1
88
90
87
82
September
84.4
86
90
85
83
October
84.6
90
89
85
67
November
88.3
95
91
89
83
December
88.0
91
89
89
87
Average
86.6
91.3
89.7
89.2
86.3
83.5
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.