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Beyond the Forecast

January 11 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 January 11, Los Angeles, CA typically reaches 68°F, but has run anywhere from 60°F to 82°F in eight years out of ten. About 85% of January 11s see no measurable precipitation.

Daytime high68°F
60°F8 years in 10 land in here82°F
Overnight low49°F
43°F8 years in 10 land in here56°F

The odds on January 11

85%
Dry day
No measurable precipitation

Odds computed from the last 30 years (19972026).

This date is moving

Highs around January 11 have warmed about 0.4°F per decade since 1970 — roughly 2.5°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: 855 daily observations from LOS ANGELES DOWNTOWN/USC, covering 19702026. We pool every day within 7 days of January 11 — 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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