Bonanza, OR climate
Bonanza has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 87°, a January night drops to 20°, and about 23 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Bonanza feels like
Winter
Spring
Summer
Fall
Bonanza 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 42° | 20° | 1.7" | 6.2" | 15 | 24° – 39° |
| February | 46° | 22° | 1.2" | 4.0" | 11 | 28° – 41° |
| March | 52° | 26° | 1.5" | 2.8" | 13 | 33° – 45° |
| April | 58° | 29° | 1.1" | 1.6" | 11 | 40° – 49° |
| May | 68° | 36° | 1.2" | 0.1" | 9 | 45° – 60° |
| June | 77° | 41° | 0.7" | 0 | 5 | 54° – 66° |
| July | 87° | 47° | 0.3" | 0 | 2 | 57° – 71° |
| August | 86° | 44° | 0.2" | 0 | 2 | 61° – 69° |
| September | 78° | 38° | 0.4" | 0 | 3 | 55° – 62° |
| October | 65° | 30° | 0.7" | 0.1" | 6 | 43° – 53° |
| November | 50° | 24° | 1.4" | 3.0" | 12 | 28° – 42° |
| December | 41° | 19° | 1.9" | 5.0" | 13 | 24° – 35° |
| Year | 62° | 31° | 12.2" | 22.8" | 102 |
“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 Bonanza
Bonanza gets 12 inches of rain and melted snow a year. December is the wettest month and August the driest. Rain or snow falls on about 102 days a year.
About 114 frost-free days a year
In half of years the last 32° night comes by May 31 and the first one by September 21. That leaves about 114 frost-free days for gardens, shorter than 98% of U.S. towns.
Heating and cooling a home in Bonanza
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Bonanza, 98% of that work is heating and 2% 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.
How Bonanza 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 Bonanza averaged 1.6° warmer than the 1900s. The biggest change is in January (+3.3°). The shift is larger than in 74% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Bonanza’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from 24° to 39°. September is the most reliable, staying within 8°.
Common questions about Bonanza’s climate
What is the coldest month in Bonanza?
December, with a typical high of 41° and a low of 19°.
What is the hottest month in Bonanza?
July, with a typical high of 87° and a low of 47°. About 16 days a year reach 90°.
How much snow does Bonanza get?
About 23 inches in a normal winter, most of it in January.
When is the first frost in Bonanza?
In half of years the first 32° night comes by September 21, and the last spring frost by May 31.
What is the rainiest month in Bonanza?
December, with 1.9 inches of rain and melted snow. The year totals 12 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Bonanza itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Tulelake, CA (17 mi, snow) and Gerber Dam, OR (14 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.