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
93.7
97
95
95
90
96
February
92.8
94
96
96
87
92
March
93.7
94
88
94
94
97
April
96.4
98
97
95
99
May
95.8
95
94
95
94
June
97.3
96
96
97
98
July
96.3
98
94
95
95
August
94.4
96
96
94
94
September
95.5
93
98
97
96
October
93.1
90
97
90
93
November
95.7
94
96
97
95
December
93.4
97
86
94
90
Average
94.9
95.0
94.5
95.1
93.8
95.0
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.