Chesterfield Historic District · Photo: Val Roberts and Chesterfield Foundation, Inc · CC BY-SA 3.0Precipitation in Bancroft trails that of 91% of U.S. towns: 17 inches a year
Sunny July days climb to about 85°. Winter and summer sit 72° apart. Its January nights bite harder than in 89% of U.S. towns. The frost-free window for a garden runs roughly May 29 to September 17.
A year in Bancroft at a glance
Each month’s typical high and low, and what it brings.
What stands out about Bancroft’s climate
Compared with towns across the U.S., with Bancroft’s place in Idaho beside it.
What a year in Bancroft feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 111 frost-free days a year
In half of years the last 32° night comes by May 29 and the first by September 17. Frost and day counts come from NOAA’s station at Grace, ID, 12 miles from the town’s center, 120 ft higher.
The 2023 USDA map puts Bancroft’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −15°. 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 45 inches of snow a winter
Snow, measured at Mccammon, ID, falls mostly in January. Precipitation (rain plus melted snow) adds up to 17 inches a year; May is the wettest month and July the driest. Rain or snow falls on about 94 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Bancroft
97% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Grace, ID.
Living with Bancroft’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
111 frost-free days in zone 5a. The last frost comes by May 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 Sep 17.
Months with highs of 62–84° and lows of 40° or more: June. 1.3 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Bancroft from natural hazards, river flooding is the largest share (35%); heat waves, cold waves, winter storms and ice storms together are 13%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Bancroft and similar climates
TownRatings has no climate map of the towns around Bancroft yet.
Climates most like Bancroft’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 |
|---|---|---|---|---|
| Bancroft, ID | 13° | 85° | 17" | 45" |
| Rapid Valley, SD | 14° | 86° | 19" | 49" |
| Gillette, WY | 13° | 86° | 16" | 56" |
| Glenwood Springs, CO | 14° | 87° | 15" | 39" |
| Doney Park, AZ | 17° | 86° | 16" | 52" |
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 Bancroft averaged 1.3° warmer than the 1900s. The biggest change is in March (+3.2°).
A smaller shift than in 53% 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 Bancroft compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Bancroft’s place among Idaho’s.
Bancroft weather by month
Highs, lows and precipitation from NOAA’s grid at Bancroft’s center; snow, wet days and snow on the ground from Mccammon, ID. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 32° | 13° | 1.9" | 16.8" | 11 | 16° – 30° |
| February | 36° | 15° | 1.5" | 7.0" | 9 | 21° – 34° |
| March | 46° | 24° | 1.5" | 3.5" | 9 | 29° – 42° |
| April | 55° | 30° | 1.6" | 1.6" | 9 | 37° – 48° |
| May | 65° | 37° | 2.2" | 0.1" | 9 | 44° – 58° |
| June | 75° | 43° | 1.2" | 0.0" | 7 | 53° – 65° |
| July | 85° | 50° | 0.7" | 0.0" | 4 | 57° – 74° |
| August | 84° | 48° | 0.9" | 0.0" | 5 | 60° – 70° |
| September | 74° | 40° | 1.4" | 0.0" | 5 | 53° – 61° |
| October | 59° | 31° | 1.4" | 0.6" | 7 | 35° – 51° |
| November | 44° | 22° | 1.2" | 2.2" | 8 | 24° – 41° |
| December | 32° | 14° | 1.9" | 12.9" | 12 | 18° – 28° |
| Year | 57° | 31° | 17.2" | 44.7" | 94 |
How much a month can swing
A normal is an average. July swings the most: from 1991 to 2020 its average ranged from 57° to 74°. September is the most reliable, staying within 8°.
Where Bancroft’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 Bancroft’s center.
- Snow: Mccammon, ID.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Grace, ID, 12 miles from the town’s center, 120 ft higher; 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 Bancroft’s climate
What is the weather like in Bancroft?
A typical July afternoon reaches 85°, a January night drops to 13°, and about 45 inches of snow falls in a normal winter. Colder January nights than 89% of U.S. towns; hotter July afternoons than 52% of U.S. towns.
How cold does it get in Bancroft in winter?
January nights average 13°. About 200 nights a year reach 32° or below and 19 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does Bancroft get?
About 45 inches in a normal winter at Mccammon, ID, most of it in January.
How hot does it get in Bancroft?
July, with a typical high of 85° and a low of 50°. About 25 days a year reach 90° (Grace, ID).
When is the first and last frost in Bancroft?
In half of years the last spring frost (32°) comes by May 29 and the first fall frost by September 17, about 111 frost-free days, at Grace, ID.
What growing zone is Bancroft in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −15°.
What is the best time of year to visit Bancroft?
By one simple rule (highs of 62–84° and lows of 40° or more), June. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Bancroft getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 53% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Bancroft.
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.