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
92.9
97
96
98
98
99
February
95.7
94
98
93
99
95
March
95.7
97
98
93
98
95
April
97.4
94
97
99
99
97
May
96.6
95
96
100
99
June
97.6
96
96
99
99
July
97.9
94
98
99
99
August
96.5
98
93
99
99
September
97.9
96
99
100
100
October
98.3
98
99
97
100
November
98.7
100
99
100
100
December
95.8
96
95
95
99
Average
96.6
95.3
96.7
96.4
98.5
98.3
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.