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
94.3
89
99
99
96
86
February
95.7
94
99
94
93
95
March
96.7
97
96
96
99
94
April
96.4
96
97
96
98
94
May
97.8
99
97
97
97
June
98.6
99
99
100
98
July
95.7
99
96
100
98
August
97.0
98
99
99
98
September
96.8
97
97
99
98
October
96.7
96
99
99
96
November
95.1
91
95
99
96
December
94.3
94
96
98
93
Average
96.1
93.9
96.9
96.7
98.1
95.2
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.