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
97.4
99
100
98
100
96
February
91.7
98
99
91
100
87
March
96.8
98
99
97
97
99
April
96.3
99
95
99
97
May
96.8
100
99
95
93
June
94.5
95
94
94
94
July
92.9
96
96
94
87
August
95.3
94
95
96
94
September
93.8
92
94
95
90
October
96.3
97
94
94
96
November
98.3
99
100
98
95
December
97.4
100
100
95
100
Average
95.9
98.6
97.1
95.7
95.6
93.8
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.