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
99.1
100
100
99
100
99
February
98.8
100
97
100
99
100
March
95.3
88
95
96
96
96
April
93.7
91
92
95
95
May
93.8
100
92
94
94
June
97.8
0
100
94
99
July
98.7
100
100
99
96
August
97.1
100
94
100
97
September
92.2
88
82
90
October
89.6
33
83
65
90
November
94.8
0
96
95
97
December
96.7
100
97
99
95
Average
95.1
91.7
94.4
94.1
96.5
95.3
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.