Photo: Ammodramus · Public domainPetersburg has colder winter nights than 91% of U.S. towns
Midsummer highs settle at about 85°. May is the wettest month, January the driest. By precipitation alone, it ranks drier than 87% of U.S. towns. Seedlings are safe outdoors from about April 29, with the first autumn frost due around October 9.
A year in Petersburg at a glance
Each month’s typical high and low, and what it brings.
What stands out about Petersburg’s climate
Compared with towns across the U.S., with Petersburg’s place in Nebraska beside it.
What a year in Petersburg feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 162 frost-free days a year
In half of years the last 32° night comes by April 29 and the first by October 9. Frost and day counts come from NOAA’s station at Elgin, NE, 9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Petersburg’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −14°. 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 Loretto 7w, NE, is heaviest from January through March, about 7 inches a month. Precipitation (rain plus melted snow) adds up to 28 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 89 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Petersburg
90% 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 Elgin, NE.
Living with Petersburg’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
162 frost-free days in zone 5b. The last frost comes by Apr 29 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 9.
Months with highs of 62–84° and lows of 40° or more: May, June, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Petersburg from natural hazards, hail is the largest share (37%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Petersburg and similar climates
TownRatings has no climate map of the towns around Petersburg yet.
Climates most like Petersburg’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 |
|---|---|---|---|---|
| Petersburg, NE | 12° | 85° | 28" | 34" |
| Storm Lake, IA | 9° | 83° | 31" | 31" |
| Sturgis, SD | 14° | 85° | 22" | 48" |
| Mount Pleasant, MI | 15° | 83° | 33" | 39" |
| Marshall, MN | 6° | 84° | 28" | 44" |
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 Petersburg averaged 0.9° warmer than the 1900s. The biggest change is in January (+3.1°).
A smaller shift than in 82% 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 Petersburg compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Petersburg’s place among Nebraska’s.
Petersburg weather by month
Highs, lows and precipitation from NOAA’s grid at Petersburg’s center; snow, wet days and snow on the ground from Loretto 7w, NE. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 33° | 12° | 0.6" | 7.4" | 5 | 17 | 16° – 37° |
| February | 37° | 16° | 0.8" | 7.1" | 6 | 14 | 15° – 35° |
| March | 49° | 26° | 1.6" | 6.7" | 7 | 7 | 29° – 52° |
| April | 60° | 36° | 2.8" | 3.4" | 10 | 2 | 39° – 54° |
| May | 71° | 47° | 4.3" | 0.0" | 11 | 0 | 53° – 64° |
| June | 81° | 58° | 4.1" | 0.0" | 11 | 0 | 65° – 74° |
| July | 85° | 62° | 3.1" | 0.0" | 9 | 0 | 67° – 80° |
| August | 82° | 61° | 3.7" | 0.0" | 9 | 0 | 66° – 76° |
| September | 76° | 51° | 2.5" | 0.0" | 7 | 0 | 58° – 69° |
| October | 63° | 38° | 2.3" | 1.0" | 7 | 1 | 43° – 54° |
| November | 48° | 25° | 1.1" | 3.4" | 5 | 5 | 28° – 46° |
| December | 35° | 16° | 0.8" | 5.0" | 5 | 14 | 15° – 31° |
| Year | 60° | 37° | 27.5" | 34.0" | 89 | 59 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 29° to 52°. June is the most reliable, staying within 9°.
Where Petersburg’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 Petersburg’s center.
- Snow: Loretto 7w, NE.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Elgin, NE, 9 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 Petersburg’s climate
What is the weather like in Petersburg?
A typical July afternoon reaches 85°, a January night drops to 12°, and about 34 inches of snow falls in a normal winter. Colder January nights than 91% of U.S. towns; cooler July afternoons than 54% of U.S. towns.
How cold does it get in Petersburg in winter?
January nights average 12°. About 153 nights a year reach 32° or below and 15 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does Petersburg get?
About 34 inches in a normal winter at Loretto 7w, NE, heaviest from January through March, about 7 inches a month, with snow on the ground about 59 days a year.
How hot does it get in Petersburg?
July, with a typical high of 85° and a low of 62°. About 17 days a year reach 90° (Elgin, NE).
When is the first and last frost in Petersburg?
In half of years the last spring frost (32°) comes by April 29 and the first fall frost by October 9, about 162 frost-free days, at Elgin, NE.
What growing zone is Petersburg in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −14°.
What is the best time of year to visit Petersburg?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Petersburg getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 82% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Petersburg.
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.