Hennessey reaches 100° on about 23 days a year, more than 97% of U.S. towns
A typical July afternoon reaches 95°, a January night drops to 26°, and about 9 inches of snow falls in a normal winter.
A year in Hennessey at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hennessey’s climate
Compared with towns across the U.S., with Hennessey’s place in Oklahoma beside it.
What a year in Hennessey feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 198 frost-free days a year
In half of years the last 32° night comes by April 14 and the first by October 30. Frost and day counts come from NOAA’s station at Hennessey 4 Ese, OK, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Hennessey’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 4°. 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 9 inches of snow a winter
Snow, measured at Hennessey 4 Ese, OK, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 34 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 73 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Hennessey
69% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Hennessey 4 Ese, OK.
Living with Hennessey’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
198 frost-free days in zone 7a. The last frost comes by Apr 14 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 30.
Months with highs of 62–84° and lows of 40° or more: April, May and October. 1.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Hennessey from natural hazards, tornadoes are the largest share (23%); heat waves, cold waves, winter storms and ice storms together are 32%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hennessey and similar climates
TownRatings has no climate map of the towns around Hennessey yet.
Climates most like Hennessey’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Hennessey, OK | 26° | 95° | 34" | 9.1" |
| McPherson, KS | 20° | 92° | 32" | 14" |
| Wichita Falls, TX | 30° | 97° | 30" | 3.1" |
| Oakhurst, CA | 34° | 95° | 29" | 2.5" |
| Central Point, OR | 32° | 93° | 22" | 3.4" |
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 Hennessey averaged 0.6° warmer than the 1900s. The biggest change is in January (+2.1°).
A smaller shift than in 96% 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 Hennessey compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hennessey’s place among Oklahoma’s.
Hennessey weather by month
Highs, lows and precipitation from NOAA’s grid at Hennessey’s center; snow, wet days and snow on the ground from Hennessey 4 Ese, OK. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 48° | 26° | 1.1" | 3.1" | 4 | 32° – 46° |
| February | 53° | 29° | 1.4" | 1.6" | 5 | 34° – 49° |
| March | 62° | 38° | 2.5" | 1.2" | 7 | 43° – 60° |
| April | 72° | 46° | 3.5" | 0.0" | 7 | 53° – 66° |
| May | 80° | 57° | 5.0" | 0.0" | 9 | 64° – 76° |
| June | 90° | 67° | 4.5" | 0.0" | 8 | 74° – 85° |
| July | 95° | 71° | 3.2" | 0.0" | 6 | 78° – 91° |
| August | 94° | 70° | 3.4" | 0.0" | 6 | 74° – 88° |
| September | 86° | 61° | 2.7" | 0.0" | 5 | 70° – 81° |
| October | 74° | 49° | 3.1" | 0.0" | 6 | 54° – 67° |
| November | 60° | 37° | 1.8" | 0.4" | 5 | 43° – 56° |
| December | 50° | 28° | 1.6" | 2.8" | 6 | 29° – 43° |
| Year | 72° | 48° | 33.8" | 9.1" | 73 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 43° to 60°. September is the most reliable, staying within 11°.
Where Hennessey’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 Hennessey’s center.
- Snow: Hennessey 4 Ese, OK.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hennessey 4 Ese, OK, 4 miles from the town’s center, at about the same height; 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 Hennessey’s climate
What is the weather like in Hennessey?
A typical July afternoon reaches 95°, a January night drops to 26°, and about 9 inches of snow falls in a normal winter. Milder January nights than 65% of U.S. towns; hotter July afternoons than 95% of U.S. towns.
How cold does it get in Hennessey in winter?
January nights average 26°. About 94 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 32°.
How much snow does Hennessey get?
About 9.1 inches in a normal winter at Hennessey 4 Ese, OK, most of it in January and December.
How hot does it get in Hennessey?
July, with a typical high of 95° and a low of 71°. About 80 days a year reach 90° and 23 reach 100° (Hennessey 4 Ese, OK).
When is the first and last frost in Hennessey?
In half of years the last spring frost (32°) comes by April 14 and the first fall frost by October 30, about 198 frost-free days, at Hennessey 4 Ese, OK.
What growing zone is Hennessey in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 4°.
What is the best time of year to visit Hennessey?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Hennessey getting warmer?
Yes: 1991–2020 averaged 0.6° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 96% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hennessey.
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.