Hartley, CA climate
Hartley has mild winters and hot summers, with very little rain. A typical July afternoon reaches 93°, a January night drops to 39°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Hartley feels like
Winter
Spring
Summer
Fall
Hartley 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 | 57° | 39° | 4.9" | 0 | 12 | 0 | 44° – 53° |
| February | 62° | 42° | 4.7" | 0 | 10 | 0 | 47° – 56° |
| March | 67° | 44° | 3.2" | 0 | 9 | 0 | 49° – 62° |
| April | 73° | 47° | 1.3" | 0 | 5 | 0 | 55° – 64° |
| May | 80° | 52° | 0.8" | 0 | 3 | 0 | 58° – 74° |
| June | 88° | 57° | 0.1" | 0 | 1 | 0 | 68° – 75° |
| July | 93° | 58° | 0.0" | 0 | 0 | 0 | 72° – 80° |
| August | 93° | 58° | 0.0" | 0 | 0 | 0 | 72° – 79° |
| September | 89° | 56° | 0.1" | 0 | 1 | 0 | 69° – 75° |
| October | 79° | 50° | 0.9" | 0 | 3 | 0 | 61° – 69° |
| November | 66° | 43° | 2.2" | 0 | 7 | 0 | 48° – 59° |
| December | 57° | 39° | 4.8" | 0 | 11 | 0 | 44° – 53° |
| Year | 75° | 49° | 22.9" | 0.0" | 63 | 0 |
“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 Hartley
Hartley gets 23 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 63 days a year.
About 283 frost-free days a year
In half of years the last 32° night comes by February 18 and the first one by November 28. That leaves about 283 frost-free days for gardens, longer than 94% of U.S. towns.
Heating and cooling a home in Hartley
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Hartley, 64% of that work is heating and 36% is cooling.
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.
Hartley and its neighbors
Hartley borders 2 towns with climate data. January nights across them vary by 0.4°. Allendale has both the coldest January nights (39°) and the hottest July afternoons (93°). Hartley’s January low is 39° and its July high 93°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.