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
81.4
92
82
92
79
63
February
79.6
83
81
82
78
75
March
96.5
100
100
98
85
100
April
98.9
100
100
97
99
May
99.8
100
100
99
100
June
99.1
99
99
100
99
July
96.7
95
97
99
97
August
96.4
97
97
98
97
September
95.6
95
96
98
95
October
97.3
98
97
98
98
November
98.9
100
100
98
100
December
96.7
99
100
91
100
Average
94.7
92.0
96.1
96.7
94.0
94.4
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.