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
88.6
95
79
98
88
99
February
92.8
96
92
93
99
96
March
94.2
93
98
86
96
99
April
94.7
96
92
93
99
May
98.8
98
99
99
99
June
99.1
100
100
99
99
July
99.5
99
100
99
99
August
97.0
100
99
100
99
September
94.0
97
69
98
100
October
98.7
100
100
100
99
November
98.2
100
97
98
100
December
98.2
97
95
99
98
Average
95.8
94.5
96.0
94.0
97.0
98.7
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.