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
99.6
100
100
99
100
100
February
99.0
99
97
99
100
100
March
98.6
99
98
98
99
100
April
97.9
98
98
99
99
May
96.5
97
94
94
96
June
93.8
86
92
94
99
July
94.7
93
95
95
97
August
95.8
91
93
91
100
September
98.9
97
99
100
99
October
99.5
100
99
100
100
November
99.1
100
94
100
100
December
99.4
99
100
99
100
Average
97.9
99.0
96.3
96.4
97.5
99.0
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.