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
95.6
99
95
94
98
February
94.1
96
98
90
97
March
85.3
82
89
81
April
86.8
88
84
100
100
May
87.2
93
87
96
June
94.8
96
89
99
July
96.9
95
95
100
99
August
96.9
97
97
99
September
92.7
100
90
99
October
85.0
90
83
November
84.3
92
86
88
December
91.4
93
93
90
Average
91.8
97.2
93.1
89.7
88.9
95.4
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.