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
83.9
84
96
85
78
83
February
90.8
97
88
97
82
95
March
95.6
90
99
95
99
98
April
97.3
96
96
99
100
May
97.3
99
100
98
99
June
98.0
100
100
94
99
July
99.2
100
100
97
100
August
98.4
96
99
98
100
September
96.9
99
97
97
98
October
90.1
98
87
79
91
November
80.4
98
86
77
68
December
81.3
83
72
82
88
Average
93.4
90.3
96.5
94.7
91.6
94.5
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.