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
82.2
91
82
95
91
68
February
89.0
98
99
99
88
97
March
95.0
97
94
100
99
95
April
96.0
99
95
93
99
May
96.5
89
99
95
98
June
98.6
97
100
100
98
July
98.7
98
100
100
99
August
98.5
97
100
99
97
September
96.8
97
95
100
100
October
93.6
97
91
91
95
November
78.4
97
73
75
69
December
77.7
85
38
82
51
Average
93.3
95.8
94.5
93.4
93.7
91.1
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.