George Caleb Bingham House · Photo: Piaget-van Ravenswaay · Public domainNeither notably warm, cold, wet nor dry, Arrow Rock sits near the middle of U.S. towns
Midwinter brings lows of about 20°. Its July heat outdoes that of 69% of U.S. towns. The latest 30-year average runs 0.9° warmer than 1901–2000’s, with December up the most. Warm coats and heating bills mark the months from November to March, when means dip under 50°.
A year in Arrow Rock at a glance
Each month’s typical high and low, and what it brings.
What stands out about Arrow Rock’s climate
Compared with towns across the U.S., with Arrow Rock’s place in Missouri beside it.
What a year in Arrow Rock feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 191 frost-free days a year
In half of years the last 32° night comes by April 13 and the first by October 22. Frost and day counts come from NOAA’s station at New Franklin 1w, MO, 11 miles from the town’s center, at about the same height.
The 2023 USDA map puts Arrow Rock’s center in zone 6b: 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 10 inches of snow a winter
Snow, measured at New Franklin 1w, MO, falls mostly in February. Precipitation (rain plus melted snow) adds up to 41 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 107 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Arrow Rock
81% 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 New Franklin 1w, MO.
Living with Arrow Rock’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
191 frost-free days in zone 6b. The last frost comes by Apr 13 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 22.
Months with highs of 62–84° and lows of 40° or more: April, May, September and October. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Arrow Rock from natural hazards, river flooding is the largest share (61%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Arrow Rock and similar climates
TownRatings has no climate map of the towns around Arrow Rock yet.
Climates most like Arrow Rock’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 |
|---|---|---|---|---|
| Arrow Rock, MO | 20° | 88° | 41" | 10" |
| East Alton, IL | 23° | 88° | 42" | 11" |
| Iola, KS | 22° | 90° | 42" | 7.4" |
| Hamilton, OH | 22° | 87° | 43" | 9.7" |
| Terre Haute, IN | 21° | 87° | 43" | 15" |
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 Arrow Rock averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.1°).
A smaller shift than in 84% 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 Arrow Rock compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Arrow Rock’s place among Missouri’s.
Arrow Rock weather by month
Highs, lows and precipitation from NOAA’s grid at Arrow Rock’s center; snow, wet days and snow on the ground from New Franklin 1w, MO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 20° | 1.6" | 2.9" | 7 | 5 | 23° – 40° |
| February | 44° | 24° | 2.0" | 3.7" | 7 | 4 | 24° – 44° |
| March | 55° | 34° | 2.9" | 0.7" | 9 | 1 | 37° – 58° |
| April | 66° | 44° | 4.4" | 0.1" | 11 | 0 | 47° – 61° |
| May | 76° | 54° | 4.9" | 0.0" | 12 | 0 | 59° – 74° |
| June | 84° | 64° | 4.8" | 0.0" | 10 | 0 | 70° – 78° |
| July | 88° | 68° | 4.6" | 0.0" | 9 | 0 | 73° – 85° |
| August | 87° | 65° | 3.8" | 0.0" | 9 | 0 | 70° – 82° |
| September | 80° | 57° | 4.1" | 0.0" | 8 | 0 | 63° – 75° |
| October | 68° | 45° | 3.3" | 0.0" | 9 | 0 | 50° – 62° |
| November | 54° | 34° | 2.7" | 0.5" | 8 | 1 | 37° – 52° |
| December | 43° | 25° | 1.9" | 2.4" | 7 | 2 | 19° – 42° |
| Year | 65° | 44° | 41.0" | 10.3" | 107 | 12 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 19° to 42°. June is the most reliable, staying within 8°.
Where Arrow Rock’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 Arrow Rock’s center.
- Snow: New Franklin 1w, MO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: New Franklin 1w, MO, 11 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 Arrow Rock’s climate
What is the weather like in Arrow Rock?
A typical July afternoon reaches 88°, a January night drops to 20°, and about 10 inches of snow falls in a normal winter. Colder January nights than 57% of U.S. towns; hotter July afternoons than 69% of U.S. towns.
How cold does it get in Arrow Rock in winter?
January nights average 20°. About 113 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 23°.
How much snow does Arrow Rock get?
About 10 inches in a normal winter at New Franklin 1w, MO, most of it in February, with snow on the ground about 12 days a year.
How hot does it get in Arrow Rock?
July, with a typical high of 88° and a low of 68°. About 31 days a year reach 90° and 2 reach 100° (New Franklin 1w, MO).
When is the first and last frost in Arrow Rock?
In half of years the last spring frost (32°) comes by April 13 and the first fall frost by October 22, about 191 frost-free days, at New Franklin 1w, MO.
What growing zone is Arrow Rock in?
Zone 6b 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 Arrow Rock?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Arrow Rock getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 84% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Arrow Rock.
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.