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
97.0
100
94
97
95
97
February
96.4
99
92
99
93
98
March
96.4
98
95
94
94
98
April
96.0
96
93
99
94
May
97.7
93
99
98
99
June
97.3
93
97
98
98
July
97.6
95
97
97
98
August
96.0
86
98
95
98
September
95.5
79
96
99
98
October
97.3
93
97
97
99
November
98.1
94
99
99
98
December
97.3
98
97
95
97
Average
97.1
99.0
92.2
96.8
96.4
97.6
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.