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
81.8
86
72
91
78
89
February
86.8
97
89
88
77
97
March
90.6
82
96
95
92
87
April
97.6
97
100
100
98
May
99.3
99
100
100
99
June
99.8
100
100
100
100
July
99.7
100
100
100
99
August
99.6
100
100
100
98
September
98.9
97
100
100
98
October
96.4
98
99
94
90
November
91.0
99
90
88
90
December
78.8
85
85
73
73
Average
93.5
88.2
95.1
96.4
93.0
93.8
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.