@NannyPatty we are currently at -5 oc overnight here and around 13 - 19 oc during the days here. We live on a mountain plateau inland on the east coast of Australia. Summers here are average day temperatures of around 30 - 45 oc and winters anywhere from - 11 oc - 3 oc in the mornings to 13 - 20 oc during the days we vary during every year. The first year we moved here the summer was 45 oc and the first winter was -11 oc in the mornings.
In winter we plant most of our frost sensitive plants such as tomatoes so they are somewhat protected from frosts near fences etc and silver beet and capsicums under the canopies of eucalypt trees which seems to be working for us. I saved the seeds from heirloom cherry tomato seeds that survived the frosts over 4 years and now we have sort of our own acclimatised breed of frost resistant cherry tomatoes we eat fairly much all year round unless we get hot summers.
I freeze cherry tomatoes whole after washing to get us through the hotter summer months.