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
98.0
99
97
96
98
99
February
97.5
95
98
96
97
98
March
95.8
87
99
96
95
95
April
94.0
90
97
96
97
May
93.8
91
97
97
97
June
88.6
90
86
98
82
July
86.3
95
80
91
88
August
91.8
96
91
87
91
September
91.9
89
99
84
93
October
97.1
97
99
97
97
November
97.2
93
99
95
99
December
97.7
94
99
100
99
Average
94.6
94.1
94.0
94.8
94.6
95.2
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.