Photo: Nyttend · Public domainIn Lewisville, July heat, January chill and rainfall all sit near the middle of U.S. towns
In January the night’s low is typically 21°. Temperatures cover 63° across the year, low to high. Summers stay cool: July afternoons here are cooler than in 70% of U.S. towns. Warm coats and heating bills mark the months from November to March, when means dip under 50°.
A year in Lewisville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Lewisville’s climate
Compared with towns across the U.S., with Lewisville’s place in Ohio beside it.
What a year in Lewisville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 167 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 14. Frost and day counts come from NOAA’s station at Caldwell 3se, OH, 14 miles from the town’s center, 340 ft lower.
The 2023 USDA map puts Lewisville’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −2°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 45 inches of rain a year
June is the wettest month and February the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Lewisville
89% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Caldwell 3se, OH.
Living with Lewisville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
167 frost-free days in zone 6b. The last frost comes by Apr 30 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 14.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Lewisville from natural hazards, river flooding is the largest share (57%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Lewisville and similar climates
TownRatings has no climate map of the towns around Lewisville yet.
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Lewisville averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.6°).
A smaller shift than in 71% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Lewisville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Lewisville’s place among Ohio’s.
Lewisville weather by month
Highs, lows and precipitation from NOAA’s grid at Lewisville’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 37° | 21° | 3.5" | 21° – 38° |
| February | 41° | 23° | 2.8" | 20° – 40° |
| March | 51° | 30° | 3.6" | 34° – 52° |
| April | 64° | 40° | 4.0" | 46° – 57° |
| May | 73° | 49° | 4.3" | 54° – 68° |
| June | 80° | 58° | 4.7" | 65° – 72° |
| July | 83° | 61° | 4.6" | 68° – 76° |
| August | 82° | 60° | 3.8" | 67° – 76° |
| September | 76° | 53° | 3.6" | 62° – 69° |
| October | 65° | 42° | 3.1" | 50° – 59° |
| November | 52° | 33° | 3.1" | 36° – 48° |
| December | 42° | 26° | 3.6" | 23° – 44° |
| Year | 62° | 41° | 44.6" |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 23° to 44°. June is the most reliable, staying within 7°.
Where Lewisville’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Lewisville’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Caldwell 3se, OH, 14 miles from the town’s center, 340 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Lewisville’s climate
What is the weather like in Lewisville?
A typical July afternoon reaches 83°, a January night drops to 21°. Colder January nights than 56% of U.S. towns; cooler July afternoons than 70% of U.S. towns.
How cold does it get in Lewisville in winter?
January nights average 21°. About 126 nights a year reach 32° or below and 4 reach 0° or below. In the coldest January of the last 30 years the month averaged 21°.
How hot does it get in Lewisville?
July, with a typical high of 83° and a low of 61°. About 7 days a year reach 90° (Caldwell 3se, OH).
When is the first and last frost in Lewisville?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 14, about 167 frost-free days, at Caldwell 3se, OH.
What growing zone is Lewisville in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −2°.
What is the best time of year to visit Lewisville?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Lewisville getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Lewisville.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.