Figure 6 in A long-term survey of spring monarch butterflies in north-central Florida

Figure 6. Appearance of adults at Cross Creek calculated as the number captured per hour, averaged for each week from 1994 through 2017 (excluding 1997, 2000–2001, 2003). The earliest arrival was 14 March (week of 8–14 March). Not all weeks were surveyed in each year. Means are shown with 95% CI. Based on observations of a total of 865 adults.