Threshold Explorer: Count Days Above or Below Any Value
Pick a city, an element, a threshold, months and years, and count the qualifying days, first and last dates and streaks in your browser from the full daily history.
Key Facts
- The explorer loads one compact history file per city and computes any threshold, month filter and streak in the browser. No query leaves the page.
- 0 cities have a history file in this build.
- History files use the format wem-history-1: one row per day with the date and five values in tenths, documented on the data page.
Try Your Own Threshold
runs in your browserChoose a city and a threshold, then count days.
| Year | Days | First date | Last date | Longest streak in year | Coverage |
|---|
Longest streaks
Notes
- Thresholds typed in Fahrenheit are converted to tenths of a degree Celsius once, rounding half up, exactly as the fixed thresholds are.
- A streak is a run of consecutive calendar days that all qualify. It may cross a year end; the per year column counts runs inside the year.
- With a month filter, days outside the chosen months are not counted, and a year is complete when at least 90 percent of the chosen months' days were observed.
- The history files and their format are described on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-13 (13 October 2026). Counts are computed in your browser from the site's daily history files.
Data as of . Last revised (2026-10-14).