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
82.1
91
73
90
85
84
February
86.9
85
87
87
72
91
March
91.7
88
95
92
95
91
April
96.3
100
93
98
96
98
May
98.9
100
100
100
98
June
99.5
100
100
100
100
July
99.9
100
100
100
100
August
99.9
100
100
100
100
September
99.8
100
100
100
100
October
92.9
94
97
95
94
November
85.3
91
90
87
83
December
79.3
70
81
94
86
Average
93.5
91.3
93.1
95.7
94.7
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.