Wednesdays had the highest read and click rates in the second quarter, followed by Thursdays and Mondays, according to an eROI analysis of email marketing statistics, reports MarketingCharts. Read rates on Wednesdays were, on average, 27 percent, compared with 26 percent for Thursdays and Mondays, whereas click rates were 5 percent on Wednesdays and Thursdays.

Weekends had performed well in prior studies, eROI said, but in the current study average read rates were as low as 12 percent, with click rates at 2 percent.

eROI also looked at time-of-day email statistics: "We see spikes bookending the work day with a noticeable spike around lunchtime. Specifically, 11am and 4pm scored the highest marks for business hour read rates and click through rates."

The eROI paper may be obtained at its website.