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
98.4
100
99
100
100
100
February
90.0
91
91
95
83
100
March
82.8
87
97
83
81
73
April
79.2
100
73
83
86
May
83.0
84
93
90
87
June
94.0
100
98
99
89
July
98.7
100
99
100
98
August
96.7
89
100
100
93
September
98.2
99
99
99
98
October
95.5
100
100
95
89
November
98.8
100
100
99
100
December
96.4
100
100
99
90
Average
92.7
92.4
96.0
94.6
93.9
91.6
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.