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
87.2
88
90
90
85
86
February
87.9
89
85
87
87
89
March
87.4
82
89
84
93
88
April
87.5
85
90
91
87
May
86.9
85
91
92
75
June
92.1
95
93
95
88
July
94.6
95
94
96
94
August
95.0
95
95
93
93
September
95.9
97
95
96
94
October
93.9
95
95
94
96
November
91.9
96
96
88
95
December
87.7
84
97
90
89
Average
90.1
86.0
90.8
92.1
91.5
89.1
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.