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
87.8
92
89
81
97
82
February
88.6
86
89
91
89
88
March
90.9
96
91
97
83
95
April
94.0
99
97
96
95
May
88.9
83
91
87
96
June
90.6
93
85
88
95
July
91.3
92
91
89
89
August
95.2
96
93
95
92
September
94.0
90
99
90
92
October
93.8
97
92
87
95
November
94.4
98
97
88
87
December
91.9
92
97
88
96
Average
91.8
91.8
92.2
92.3
89.6
92.2
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.