Photo: Dmichaelburns at English Wikipedia · CC BY-SA 3.0Midwinter lows in New Vienna sink below those of 93% of U.S. towns
In July the day’s top temperature is typically 82°. Seasons differ by 71°, from the coldest nights to the warmest afternoons. Summers stay cool: July afternoons here are cooler than in 83% of U.S. towns. Comfortable outdoor weather lasts from May to September, with highs of 69–82°.
A year in New Vienna at a glance
Each month’s typical high and low, and what it brings.
What stands out about New Vienna’s climate
Compared with towns across the U.S., with New Vienna’s place in Iowa beside it.
What a year in New Vienna feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 178 frost-free days a year
In half of years the last 32° night comes by April 21 and the first by October 18. Frost and day counts come from NOAA’s station at Guttenberg L&d 10, IA, 16 miles from the town’s center, 400 ft lower.
The 2023 USDA map puts New Vienna’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −19°. 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 34 inches of snow a winter
Snow, measured at Guttenberg L&d 10, IA, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 39 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 112 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in New Vienna
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 Guttenberg L&d 10, IA.
Living with New Vienna’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
178 frost-free days in zone 5a. The last frost comes by Apr 21 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 18.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in New Vienna from natural hazards, river flooding is the largest share (61%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →New Vienna and similar climates
TownRatings has no climate map of the towns around New Vienna yet.
Climates most like New Vienna’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 |
|---|---|---|---|---|
| New Vienna, IA | 10° | 82° | 39" | 34" |
| Brookfield, WI | 13° | 82° | 35" | 37" |
| Colchester, VT | 10° | 81° | 38" | 50" |
| Volo, IL | 15° | 83° | 37" | 35" |
| Elmira, NY | 16° | 81° | 38" | 42" |
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 New Vienna averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.5°).
A smaller shift than in 87% 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 New Vienna compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with New Vienna’s place among Iowa’s.
New Vienna weather by month
Highs, lows and precipitation from NOAA’s grid at New Vienna’s center; snow, wet days and snow on the ground from Guttenberg L&d 10, IA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 10° | 1.3" | 10.0" | 9 | 24 | 8° – 31° |
| February | 31° | 14° | 1.4" | 9.3" | 8 | 21 | 9° – 35° |
| March | 44° | 26° | 2.2" | 3.7" | 9 | 9 | 27° – 50° |
| April | 58° | 36° | 3.9" | 0.7" | 11 | 1 | 38° – 53° |
| May | 69° | 48° | 4.6" | 0.0" | 12 | 0 | 53° – 65° |
| June | 78° | 58° | 5.9" | 0.0" | 11 | 0 | 66° – 72° |
| July | 82° | 62° | 4.8" | 0.0" | 9 | 0 | 66° – 78° |
| August | 80° | 60° | 4.1" | 0.0" | 9 | 0 | 64° – 76° |
| September | 73° | 52° | 3.8" | 0.0" | 9 | 0 | 56° – 68° |
| October | 60° | 39° | 3.0" | 0.3" | 9 | 0 | 45° – 55° |
| November | 44° | 28° | 2.2" | 1.2" | 8 | 2 | 28° – 47° |
| December | 31° | 17° | 1.7" | 9.2" | 9 | 16 | 10° – 34° |
| Year | 56° | 37° | 38.8" | 34.4" | 112 | 72 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 9° to 35°. June is the most reliable, staying within 7°.
Where New Vienna’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 New Vienna’s center.
- Snow: Guttenberg L&d 10, IA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Guttenberg L&d 10, IA, 16 miles from the town’s center, 400 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 New Vienna’s climate
What is the weather like in New Vienna?
A typical July afternoon reaches 82°, a January night drops to 10°, and about 34 inches of snow falls in a normal winter. Colder January nights than 93% of U.S. towns; cooler July afternoons than 83% of U.S. towns.
How cold does it get in New Vienna in winter?
January nights average 10°. About 133 nights a year reach 32° or below and 16 reach 0° or below. In the coldest January of the last 30 years the month averaged 8°.
How much snow does New Vienna get?
About 34 inches in a normal winter at Guttenberg L&d 10, IA, most of it in January, February and December, with snow on the ground about 72 days a year.
How hot does it get in New Vienna?
July, with a typical high of 82° and a low of 62°. About 13 days a year reach 90° (Guttenberg L&d 10, IA).
When is the first and last frost in New Vienna?
In half of years the last spring frost (32°) comes by April 21 and the first fall frost by October 18, about 178 frost-free days, at Guttenberg L&d 10, IA.
What growing zone is New Vienna in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −19°.
What is the best time of year to visit New Vienna?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is New Vienna getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 87% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in New Vienna.
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.