RECENT COLD GUIDE
Last night’s low and freeze check
See the lowest sampled air temperature and the freeze assessment for one completed night, from 6 p.m. to 6 a.m. local time.
YOUR LOOK BACK
Overnight assessment will appear here.
Review the whole overnight period
The selected date is the morning ending the night. Before 06:00 locally, the default is the previous completed night; at or after 06:00 it is the night ending this morning. Both dates appear with the answer. The 18:00–06:00 window is a product convention, not a meteorological definition or a sunset/sunrise calculation. Daylight-saving changes can make it 11 or 13 elapsed hours.
- Confirm the place, reporting station and straight-line distance.
- Check the lowest sampled temperature and the observation timeline.
- Look for long gaps, especially near the coldest pre-dawn hours.
- Do not treat the displayed low as an official daily minimum.
- Inspect exposed pipes, plants and low-lying areas when the exact site matters.
A station reading cannot prove frost at your property
A freeze generally refers to air temperature at or below 32°F (0°C), while frost is ice that forms on a surface. The two are related but not identical. The National Weather Service explains that frost can form near the ground when an observed air temperature is slightly above freezing.
Official station instruments are not at your garden bed, roof valley or water line. Elevation, shelter, wind, cloud cover, soil and nearby buildings or water can make a property warmer or colder than the reporting station. A sampled station low above 32°F does not rule out frost on a colder surface; a station sample below 32°F does not prove that every nearby property froze.
What the YesterSky result can support
The answer uses accepted instantaneous samples from one station across the whole window. Any sample at or below 0°C establishes a cold reading. A negative assessment requires temperature samples in at least 80% of elapsed hourly bins, with no gap over 90 minutes including the start and end. Sparse positive samples remain visible; otherwise inadequate coverage is labeled insufficient.
Use careful language: “the nearby station reported 30°F at 5:15 a.m.” is supported when that sample is visible. “My pipes froze at 5:15 a.m.” is a property claim the station record cannot establish. For a safety decision or active cold hazard, use current National Weather Service information rather than a past-weather lookup.
Read the sampling and local-date methodology for the full evidence contract.
Related recent-weather questions
Learn how to look up yesterday’s weather by ZIP code or city, check whether rain was reported yesterday, or review whether it was windy yesterday. The complete recent weather guide covers all three topics.