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
98.2
96
96
99
100
97
February
95.1
97
98
90
93
97
March
94.1
91
100
79
94
95
April
93.9
100
94
91
86
May
96.6
99
98
95
94
June
97.7
99
98
96
98
July
98.5
100
99
98
98
August
98.4
100
97
99
100
September
97.3
95
100
97
98
October
97.3
94
99
99
94
November
96.9
98
98
97
90
December
98.2
99
97
100
98
Average
96.6
94.4
98.2
95.5
96.3
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.