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
93.9
100
94
93
96
94
February
96.7
99
96
100
99
100
March
92.9
96
88
94
94
87
April
94.9
96
95
93
97
May
96.0
99
91
99
93
June
97.9
99
97
100
99
July
93.3
96
99
89
93
August
96.4
97
97
91
100
September
97.7
97
98
99
95
October
94.3
92
97
98
96
November
83.1
86
73
85
94
December
91.5
82
82
87
94
Average
94.9
98.1
94.4
94.3
94.5
95.2
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.