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
95.3
93
92
94
98
95
February
96.1
97
99
98
98
85
March
97.6
95
100
100
99
96
April
96.5
97
94
98
98
May
96.5
96
100
97
98
June
95.1
100
92
97
96
July
95.6
98
98
96
93
August
92.9
92
93
96
98
September
92.7
99
90
95
95
October
93.1
92
96
90
96
November
91.6
96
92
90
92
December
95.0
97
96
95
93
Average
94.8
94.8
96.3
95.1
95.5
94.2
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.