Historical weather data, all-time temperature records, and monthly climate averages for Jefferson, LA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Jefferson lands right in that sweet spot of spring — 127 years of data puts the average high at 77° with a low of 58°. There's about a 1-in-4 chance of rain today, though the extremes on this date tell a wilder story: it's hit 89° as recently as 1940 and somehow bottomed out at a hard freeze of 32° back in 1915.
Jefferson's weather has real teeth — the thermometer has swung from a brutal 6° in February 1899 all the way up to 104° in June 2009, a 98-degree spread. The wettest single day on record dropped a staggering 13.08 inches on October 2, 1937, and even a rare 10-inch snowfall hit in February 1895, a reminder that this Gulf Coast town isn't entirely immune to winter's extremes.
Jefferson runs hot for most of the year, with highs in the low 90s from late June through August — peak summer sits right around the week of June 25, averaging 92°. The coolest stretch is early January at 63°, which barely qualifies as a coat-and-boots situation. If you're trying to dodge rain, note that mid-July is the wettest stretch of the year, averaging over 2 inches in a single week.