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Weather extremes

How extreme does Rosario's weather get?

The hottest, coldest, wettest and snowiest days Rosario has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 34 years of daily weather observations (1991–present), from the Rosario station 14 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Rosario has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
105°F Jan 14, 2022

That is about 16°F hotter than a normal January afternoon in Rosario (typical high near 89°F).

The three most extreme on record

1 105°F Jan 14, 2022recent
2 105°F Jan 10, 2006
3 105°F Jan 16, 2022
❄️ Coldest night
17°F Jul 14, 2020

About 23°F colder than a normal July night in Rosario (typical low near 40°F).

The three most extreme on record

1 17°F Jul 14, 2020
2 18°F Aug 4, 1995
3 18°F Jun 11, 2022
🌧️ Most rain in one day
11.30 in Oct 29, 1991

More rain in a single day than Rosario usually gets in the whole month of October (typical October total about 4.6 in).

The three most extreme on record

1 11.30 in Oct 29, 1991
2 10.75 in Mar 21, 2005
3 7.95 in Apr 26, 1994

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-10°10°30°50°70°90°110°130° all-time high 105°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Rosario's record heat sits well above even a hot day for the season — January's 105°F is about 16°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Rosario's warmest days reach the high 80s°F and its coldest nights drop to the low 40s°F. But across the record it has gone as high as 105°F and as low as 17°F. A single day has delivered over 11 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Rosario, a weather station, about 14 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →