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
97.7
99
97
96
98
99
February
96.9
99
97
94
95
100
March
96.4
91
100
98
96
95
April
94.2
92
97
97
98
May
91.2
86
93
95
96
June
86.2
87
85
93
80
July
84.7
96
75
91
88
August
93.0
95
93
91
94
September
92.4
91
99
86
92
October
96.0
96
99
97
95
November
97.5
93
99
95
99
December
98.3
96
99
100
100
Average
94.4
96.1
93.9
94.0
94.6
95.1
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.