Thank you for your question. The best way to get scientifically reliable information is to go to a website with either "site:edu" or "site"gov" domain. Here is one such chart from Oregon State (site:edu):  Soil Temperature Conditions for Vegetable Seed Germination | OSU Extension Service (oregonstate.edu)

I hope this is what you are seeking.  Good luck!

I think the article I previously cited has all that you were asking for, but the following more general OSU Extension publication may help as well:  em9027.pdf (oregonstate.edu)

Thanks for the quick response, but it isn't what I was looking for.  An "Optimum range" of 55-90 is not helpful at all for determining days to germination.  Something like the chart I provided is more helpful, though the increments could be given in 10 degree differences.  I just don't know if the chart I shared is trustworthy to share with others or not, (even though it is often posted in pop media sites and some university as well) which is why I wanted a better resource that provided incremental differences showing days to germination at various soil temperatures.  I do not have the resources to conduct this kind of study myself, and I would imagine someone, somewhere has already done this.  :) 

I am afraid what I provided you is the best I could find, although you might be interested in this interactive device:  Climate Smart Farming CSF Growing Degree Day Calculator

Using your suggestion for site:edu I found this UC Davis document from the 1950's, updated Aug 2017. The second table provides what I was looking for. Hopefully some researcher will build on this and add more types of vegetable/crops  http://sacmg.ucanr.edu/files/164220.pdf

Thank you for your help!

Welcome!  Happy researching!