Temperature Compensation Chart

People tend to get overly excited about processing temperatures. Frankly, for most black and white films, it's not that critical. In fact, it's the average temperature that really matters.

There are so many other unknowns (for example, have to calibrated your shutter?), that if you're within 10% of the perfect temperature/time, you'll probably never notice the difference.

Anyway, here's the standard chart for temperature vs time: Temperature Chart. This is valid for most black and white films and developers.

More info and discussion here: Temperature Heresy