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Beyond the Forecast

July 15 in Los Angeles

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 Los Angeles actually delivers on this date, and how often.

On July 15, Los Angeles, CA typically reaches 83°F, but has run anywhere from 78°F to 90°F in eight years out of ten. About 99% of July 15s see no measurable precipitation.

Daytime high83°F
78°F8 years in 10 land in here90°F
Overnight low65°F
61°F8 years in 10 land in here69°F

The odds on July 15

99%
Dry day
No measurable precipitation
8%
90°F or hotter
Daytime high

Odds computed from the last 30 years (19972026).

Where this comes from: 855 daily observations from LOS ANGELES DOWNTOWN/USC, covering 19702026. We pool every day within 7 days of July 15 — 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 Los Angeles, CA 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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