ATTQOTD:
For the purpose of running slower, I put in less effort. So across the entire spectrum, there are paces where my effort is really high, and where my effort is really low to non-existent. In practice, the data shows that I slow down by decreasing my cadence and my stride length.
Easy days at 9 min/mile = 172 spm and 1.04m stride length
LR at 7:48 min/mile = 179 spm and 1.15m stride length
HM Tempo at 6:44 min/mile = 184 spm and 1.30m stride length
10k at 6:22 min/mile = 191 spm and 1.32m stride length
Mile at 5:42 = 190 spm and 1.48m stride length
450m at 5:08 min/mile = 200 spm and 1.57m stride length
But I'm not actively trying to lower my cadence or shorten my stride. Rather, I just put in less effort.
When it comes to the summer and the increasing temps. I just maintain the same level of effort as I did in the winter. That very well may mean that what was a 9:00 min easy pace in the spring with nice temps becomes a 10:00 min easy pace in the summer. But the effort remains the same. I've done run/walk with my daughter as slow as 14:30 min/mile pace. So I know I've got a range I can work with depending on how bad the conditions are.
For the purpose of run/walk, my recommendation is nearly the same as for continuous runners. I maintain the interval pattern and the walking pace. So the only variable I manipulate is the running pace. Like continuous runners, I suggest slowing it down to equal effort. Which means the average pace of the run will slow as well. The below is an example of a runner who is a 2:16 HM fitness level, walks at a 16:00 min/mile, and their corresponding paces with temp adjustments.
If they had a T+D day of 165 (for example a 90F temp with 75F dew point), then I would recommend their marathon tempo to be an 11:35 min/mile average as a starting point. They can definitely go slower, but don't go faster than that. If they used the Option A scheme, then their original M Tempo was a 10:49 average with a 100/30 interval set of 9:56/16:00. In order to have an average of an 11:35 min/mile, the runner would slow their running pace from a 9:56 to a 10:42 min/mile. Making it a 100/30 set of 10:42/16:00 for an average of an 11:35 min/mile.