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
96
99
99
100
February
98.7
99
98
99
100
99
March
99.1
100
99
100
100
99
April
99.2
100
98
100
100
May
99.1
98
100
99
100
June
89.5
97
91
95
84
July
82.5
79
90
82
80
August
96.1
95
100
95
97
September
96.7
95
99
96
92
October
95.5
93
96
96
97
November
98.2
95
99
97
99
December
98.3
96
100
99
100
Average
96.4
99.3
94.7
97.5
96.2
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.