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
96
100
99
98
96
February
94.5
99
92
91
99
99
March
94.9
95
98
92
93
97
April
97.5
96
96
98
97
99
May
94.7
98
88
97
92
June
94.5
92
94
97
99
July
97.8
97
96
97
98
August
96.4
91
98
97
96
September
94.8
97
87
97
97
October
95.5
96
86
96
99
November
97.8
100
96
99
99
December
95.5
94
93
96
96
Average
96.0
96.3
95.8
93.0
96.8
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.