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
88.5
93
86
96
82
90
February
92.3
85
95
92
94
98
March
93.0
94
96
94
88
98
April
95.0
96
94
98
95
May
95.3
96
95
97
98
June
94.1
94
93
94
92
July
90.4
91
89
89
81
August
92.3
96
94
87
89
September
91.4
91
91
91
92
October
93.3
89
97
94
96
November
91.4
94
97
89
91
December
88.6
90
78
91
91
Average
92.3
90.8
93.1
92.8
91.4
92.4
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.