I hope this helps, i got this out from an ebook. And it's related to CTR (Click-Through Rate - This is the number of people who click on an ad divided by the number of displays of the ad, represented in percentages. e.g. 50 people click on an ad that has been shown 1000 times, which works out at: 50/1000 X 100% = 5%) but i think it can be applied to solo ads also.
Here's the statistics
Day CTR
Sunday 5.76%
Monday 4.50%
Tuesday 4.70%
Wednesday 4.29%
Thursday 4.00%
Friday 3.92%
Saturday 4.54%
Explanation for the numbers quote from the book :
"Although there’s not much that can be done to alter your CTR by weekday, I thought I’d throw this table in just because it’s interesting. Sunday seems to be the best performing day, with Friday on the bottom. Why? And why is Tuesday better than Saturday?I have a theory–and that’s all it is, a theory, so take it with a grain of salt. Friday is low because more people are preparing for their weekend trips and activities, and so they have less time to surf the web. Saturday is low because those same people aren’t home! Sunday is high because they’re back from their activities and want to hang out at home. And what are we doing more and more for recreation at home? Web surfing!"