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
89.4
79
89
87
99
89
February
89.7
95
82
85
99
92
March
94.7
97
100
82
92
96
April
94.7
97
95
96
92
May
95.0
89
95
100
97
June
92.9
90
94
93
97
July
93.5
98
90
85
97
August
95.3
97
95
90
89
September
96.7
97
96
95
96
October
97.2
94
99
100
96
November
97.2
99
100
92
96
December
95.2
92
95
95
97
Average
94.1
92.1
93.8
92.8
93.7
94.6
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.