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Beyond the Forecast

July 13 in Minneapolis

Weather forecasts run out after about two weeks. For any date further out than that, the honest answer isn't a single number — it's the range Minneapolis actually delivers on this date, and how often.

On July 13, Minneapolis, MN typically reaches 83°F, but has run anywhere from 74°F to 90°F in eight years out of ten. About 65% of July 13s see no measurable precipitation.

Daytime high83°F
74°F8 years in 10 land in here90°F
Overnight low64°F
56°F8 years in 10 land in here72°F

The odds on July 13

65%
Dry day
No measurable precipitation
13%
90°F or hotter
Daytime high

Odds computed from the last 30 years (19972026).

This date is moving

Highs around July 13 have cooled about 0.6°F per decade since 1970 — roughly 3.2°F across the record. The figures above are shifted along that trend to 2026, so they describe today's climate rather than the average of the last 56 years.

Where this comes from: 853 daily observations from U OF MN ST PAUL, covering 19702026. We pool every day within 7 days of July 13 — a single calendar date has only about 56 readings, far too few to place a 10th percentile you'd want to trust.

Why it's not a plain average: A climatology computed straight across 19702026 describes the middle of that period, not today, so as a statement about the present it runs cold. We fit a trend on year and shift each observation to 2026 before taking the range. The probabilities use the last 30 years instead — shifting a temperature along a trend is well defined, shifting “did it rain” is not.

What this is not: Not a forecast. It is what Minneapolis, MN has actually done on this date, which is the only defensible answer once you're past the two-week horizon where real forecasts stop. Data: NOAA NCEI GHCN-Daily.

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