It seems like it should be simple enough (I tried to search but got internal errors), but a decision based reminder would be awesome and very helpful.
For example, "Alexa, Monday through Friday, if the temperature is below 25 degrees, remind me at 7:25 am to warm up my car". Behind the scenes, Alexa would check the weather at 7:25 and if the weather is below 25 degrees, she would sound a reminder to start the car to warm it up before heading to school/work.