Grattan, NE climate
Grattan has cold winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 11°, and about 26 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Grattan feels like
Winter
Spring
Summer
Fall
Grattan weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 33° | 11° | 0.5" | 4.1" | 4 | 13 | 15° – 36° |
| February | 37° | 15° | 0.7" | 5.8" | 5 | 12 | 14° – 35° |
| March | 49° | 25° | 1.4" | 4.7" | 6 | 6 | 28° – 50° |
| April | 59° | 35° | 3.0" | 1.7" | 8 | 2 | 39° – 53° |
| May | 70° | 46° | 4.1" | 0.4" | 11 | 0 | 53° – 63° |
| June | 81° | 56° | 3.7" | 0 | 10 | 0 | 64° – 74° |
| July | 86° | 61° | 3.3" | 0 | 8 | 0 | 66° – 81° |
| August | 84° | 60° | 3.3" | 0 | 9 | 0 | 66° – 76° |
| September | 76° | 50° | 2.5" | 0 | 6 | 0 | 57° – 69° |
| October | 62° | 37° | 2.3" | 0.9" | 7 | 1 | 42° – 55° |
| November | 47° | 24° | 0.9" | 2.7" | 4 | 3 | 26° – 45° |
| December | 35° | 15° | 0.7" | 5.3" | 4 | 12 | 14° – 31° |
| Year | 60° | 36° | 26.4" | 25.6" | 81 | 50 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Grattan
Grattan gets 26 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 81 days a year. Snow covers the ground about 50 days of the year.
About 155 frost-free days a year
In half of years the last 32° night comes by May 3 and the first one by October 5. That leaves about 155 frost-free days for gardens, shorter than 76% of U.S. towns.
Heating and cooling a home in Grattan
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Grattan, 89% of that work is heating and 11% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Grattan and its neighbors
Grattan borders 5 towns with climate data. January nights across them vary by 0.5°. Antelope has the coldest January nights (11°) and Emmet the hottest July afternoons (86°). Grattan’s January low is 11° and its July high 86°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Grattan compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Grattan averaged 0.8° warmer than the 1900s. The biggest change is in January (+3.0°). The shift is smaller than in 82% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Grattan’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 28° to 50°. August is the most reliable, staying within 9°.
Common questions about Grattan’s climate
What is the coldest month in Grattan?
January, with a typical high of 33° and a low of 11°.
What is the hottest month in Grattan?
July, with a typical high of 86° and a low of 61°. About 32 days a year reach 90°.
How much snow does Grattan get?
About 26 inches in a normal winter, most of it in February.
When is the first frost in Grattan?
In half of years the first 32° night comes by October 5, and the last spring frost by May 3.
What is the rainiest month in Grattan?
May, with 4.1 inches of rain and melted snow. The year totals 26 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Grattan itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at O'neill, NE (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.