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
98.8
100
100
98
97
98
February
98.0
96
99
98
98
99
March
96.8
95
99
100
95
96
April
94.0
83
93
99
98
98
May
95.3
95
97
95
98
June
89.7
87
89
94
83
July
89.1
97
85
93
90
August
91.6
96
91
88
92
September
91.0
88
100
82
97
October
95.2
95
98
92
95
November
97.4
96
99
93
100
December
98.2
95
100
99
100
Average
94.7
93.1
95.1
96.1
93.7
95.7
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.