It was 5* here this morning! That makes 10 days this month with single digit temps. I went back through my records to 2016 to see how many times this had happened in the recent past:
2024 1 day
2023 0 days
2022 0 days
2021 1 day
2020 0 days
2019 3 days (on 1-1, the low was .5*, on 1-2, the low was 2.3*, and on 1-3, the low was 7*)
2018 1 day
2017 0 days
2016 1 day
This summer had extremely high temps, and I didn't light the furnace pilot until the middle of October this year, instead of the middle of September as usual.