Nowmal › Illinois › Metropolis
Metropolis, Illinois
The week’s forecast, measured against two yardsticks: the “normal” your weather app still uses — a 1991–2020 average centered on 2005 — and the climate-adjusted normal, which here runs +0.4°F warmer. Same NOAA data. No pretending.
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Month by month
1991 called. It wants its climate baseline back.
| Month | Normal high | Adjusted high | Normal low | Adjusted low | Gap (high) |
|---|---|---|---|---|---|
| January | 43.3° | 43.6° | 26.5° | 27.8° | +0.3° |
| February | 48.2° | 49.4° | 29.7° | 31.4° | +1.2° |
| March | 58.2° | 59.6° | 37.8° | 39.5° | +1.5° |
| April | 69.4° | 70.3° | 46.9° | 47.5° | +0.9° |
| May | 77.7° | 77.9° | 56.7° | 57.9° | +0.2° |
| June | 85.8° | 85.9° | 65.1° | 65.9° | +0.1° |
| July | 88.7° | 88.1° | 68.7° | 69.7° | +-0.7° |
| August | 88.1° | 87.7° | 66.5° | 67.0° | +-0.4° |
| September | 81.9° | 81.9° | 59.1° | 59.5° | +-0.0° |
| October | 70.9° | 70.9° | 47.5° | 48.3° | +-0.0° |
| November | 57.1° | 57.8° | 37.1° | 38.0° | +0.6° |
| December | 46.7° | 48.1° | 29.9° | 31.6° | +1.4° |
The “normal” temperature in every weather app is a 30-year average (1991–2020) — a number centered on mid-2005, two decades out of date in a warming climate. The Climate-Adjusted Normal takes NOAA’s official normal and advances it to the present using this county’s own measured warming trend.
It isn’t a forecast — it’s a more honest yardstick for what “normal” means now. Read why Nowmal exists →
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About this data
The forecast is the National Weather Service’s, for Metropolis itself. Normals and the warming trend are computed at county level (Massac County) from NOAA’s homogenized climate record, because climate trends vary smoothly — nearby towns warm at statistically indistinguishable rates. Method details on the methodology page.
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