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
94.1
98
96
95
92
February
95.5
95
98
96
96
March
93.4
90
88
97
95
April
91.3
97
91
94
100
May
92.2
96
94
97
100
June
93.0
99
96
93
July
92.8
93
98
92
97
August
94.6
98
91
92
96
September
96.1
97
94
96
98
October
94.8
97
94
95
98
November
96.5
97
98
97
98
December
95.4
98
89
97
96
Average
94.2
94.0
96.0
94.5
94.6
97.1
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.