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
93.6
94
89
87
99
91
February
93.5
93
100
93
93
92
March
97.8
100
100
100
97
93
April
99.3
99
100
100
98
May
99.4
100
99
100
99
June
99.9
100
100
100
100
July
99.9
100
100
100
99
August
99.4
99
100
100
98
September
99.3
100
98
100
100
October
97.4
99
99
94
93
November
95.3
100
95
91
99
December
94.1
98
95
92
97
Average
97.0
95.4
98.5
96.9
96.9
96.3
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.