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
81.7
82
92
78
77
80
February
88.8
96
83
99
82
93
March
95.9
92
100
94
99
97
April
97.3
99
96
99
99
May
97.0
97
98
97
96
June
97.8
99
98
96
98
July
98.6
99
99
96
99
August
97.9
97
99
97
99
September
97.1
100
97
97
99
October
89.4
92
87
82
95
November
80.6
99
80
81
67
December
77.0
84
60
72
81
Average
92.8
90.4
95.8
93.1
91.4
93.5
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.