Oklahoma City University · Photo: Matthew Rutledge (rutlo) · CC BY 2.0Foster reaches 100° on about 19 days a year, more than 95% of U.S. towns
January mornings start at about 29°. Expect the heaviest rain or snow in May and the lightest in January. It is a dry place: less rain and snow fall here than on 71% of U.S. towns. Seedlings are safe outdoors from about April 5, with the first autumn frost due around November 1.
A year in Foster at a glance
Each month’s typical high and low, and what it brings.
What stands out about Foster’s climate
Compared with towns across the U.S., with Foster’s place in Oklahoma beside it.
What a year in Foster feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 210 frost-free days a year
In half of years the last 32° night comes by April 5 and the first by November 1. Frost and day counts come from NOAA’s station at Pauls Valley 4 Wsw, OK, 14 miles from the town’s center, at about the same height.
The 2023 USDA map puts Foster’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 9°. 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 37 inches of rain a year
May is the wettest month and January the driest. Rain falls on about 66 days a year. Snow is rare: about 0.8" in a normal year at Elmore City 3 Sw, OK, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Foster
61% 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 Pauls Valley 4 Wsw, OK.
Living with Foster’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
210 frost-free days in zone 7b. The last frost comes by Apr 5 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 1.
Months with highs of 62–84° and lows of 40° or more: March, April, May and October.
Parks & trails →Of the yearly building losses FEMA expects in Foster from natural hazards, river flooding is the largest share (26%); heat waves, cold waves, winter storms and ice storms together are 16%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Foster and similar climates
TownRatings has no climate map of the towns around Foster yet.
Climates most like Foster’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 |
|---|---|---|---|---|
| Foster, OK | 29° | 94° | 37" | 0.8" |
| Stephenville, TX | 34° | 95° | 34" | 0.7" |
| Clearlake, CA | 35° | 93° | 40" | 0.4" |
| Lugoff, SC | 33° | 92° | 43" | 0.4" |
| Arkansas City, KS | 23° | 93° | 37" | 6.2" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
About as warm as it used to be
The last 30 years in Foster averaged 0.2° warmer than the 1900s. The biggest change is in March (+1.5°).
A smaller shift than in all but 34 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 Foster compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Foster’s place among Oklahoma’s.
Foster weather by month
Highs, lows and precipitation from NOAA’s grid at Foster’s center; snow, wet days and snow on the ground from Elmore City 3 Sw, OK. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 52° | 29° | 1.7" | 0.3" | 4 | 0 | 36° – 49° |
| February | 57° | 33° | 1.9" | 0.1" | 5 | 0 | 38° – 54° |
| March | 65° | 41° | 2.8" | 0.1" | 6 | 0 | 47° – 61° |
| April | 74° | 49° | 3.7" | 0.0" | 7 | 0 | 56° – 68° |
| May | 81° | 58° | 5.5" | 0.0" | 8 | 0 | 67° – 75° |
| June | 89° | 67° | 4.6" | 0.0" | 7 | 0 | 74° – 85° |
| July | 94° | 71° | 2.7" | 0.0" | 5 | 0 | 79° – 91° |
| August | 94° | 70° | 2.8" | 0.0" | 5 | 0 | 75° – 90° |
| September | 86° | 62° | 3.7" | 0.0" | 6 | 0 | 70° – 82° |
| October | 75° | 51° | 3.4" | 0.0" | 5 | 0 | 57° – 68° |
| November | 63° | 39° | 2.2" | 0.0" | 5 | 0 | 46° – 57° |
| December | 54° | 31° | 2.2" | 0.3" | 5 | 0 | 34° – 47° |
| Year | 74° | 50° | 37.1" | 0.8" | 66 | 1 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 38° to 54°. May is the most reliable, staying within 9°.
Where Foster’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 Foster’s center.
- Snow: Elmore City 3 Sw, OK.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Pauls Valley 4 Wsw, OK, 14 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 Foster’s climate
What is the weather like in Foster?
A typical July afternoon reaches 94°, a January night drops to 29°, and snow is almost unheard of. Milder January nights than 71% of U.S. towns; hotter July afternoons than 94% of U.S. towns.
How cold does it get in Foster in winter?
January nights average 29°. About 84 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 36°.
How much snow does Foster get?
About 0.8 inches in a normal winter at Elmore City 3 Sw, OK, so most winters see none.
How hot does it get in Foster?
July, with a typical high of 94° and a low of 71°. About 85 days a year reach 90° and 19 reach 100° (Pauls Valley 4 Wsw, OK).
When is the first and last frost in Foster?
In half of years the last spring frost (32°) comes by April 5 and the first fall frost by November 1, about 210 frost-free days, at Pauls Valley 4 Wsw, OK.
What growing zone is Foster in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 9°.
What is the best time of year to visit Foster?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Foster getting warmer?
Yes: 1991–2020 averaged 0.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than all but 34 U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Foster.
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.