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
97.1
99
100
90
97
100
February
97.0
100
98
97
100
97
March
92.3
96
98
87
89
96
April
93.7
93
94
96
100
May
94.0
96
81
99
95
June
94.5
99
95
98
99
July
95.7
100
93
94
97
August
95.3
100
83
96
96
September
99.8
100
99
100
100
October
99.7
100
100
100
100
November
99.9
100
100
100
100
December
98.9
100
98
97
100
Average
96.5
98.0
98.5
92.6
96.9
98.1
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.