Climate Comfort Score
90/100
Excellent
NOAA 1991–2020 normals 65°F annual avg Public-domain federal data
San Jacinto, CA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 65°F
- Avg annual temp
- 90/100
- Comfort score
- 12.2"
- Annual precip
- 313d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for San Jacinto
San Jacinto, California averages 65°F a year and scores 90/100 on the comfort index - excellent, milder than 94% of U.S. cities.
- 65°F
- yearly average temperature, NOAA normal
- 90/100
- comfort score, milder than 94% of U.S. cities
- 12.2"
- annual precipitation
- 313 days
- frost-free growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
65°F (18°C)
Avg High
79°F
Avg Low
51°F
Annual Precip
12.2"
Annual Snow
0.0"
Comfort Score
90/100
Excellent
Avg Annual Temperature
65°F
30-year mean (NOAA NCEI)
Annual Precipitation
12.2"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (San Jacinto) 90.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the San Jacinto area.
How San Jacinto compares to every U.S. city
San Jacinto's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
90 Top 6% higher than 94% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for San Jacinto
MethodologyZooming out from San Jacinto's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 66°F (19°C) | 40°F (5°C) | 53°F (12°C) | 2.7" | 0.0" | 4.0 | 0.0 |
| February | 66°F (19°C) | 42°F (5°C) | 54°F (12°C) | 2.8" | 0.0" | 2.2 | 0.0 |
| March | 70°F (21°C) | 45°F (7°C) | 58°F (14°C) | 1.7" | 0.0" | 0.6 | 1.1 |
| April | 74°F (24°C) | 48°F (9°C) | 61°F (16°C) | 0.8" | 0.0" | 0.2 | 3.4 |
| May | 80°F (27°C) | 53°F (12°C) | 67°F (19°C) | 0.5" | 0.0" | 0.0 | 8.3 |
| June | 89°F (32°C) | 58°F (14°C) | 73°F (23°C) | 0.1" | 0.0" | 0.0 | 17.0 |
| July | 95°F (35°C) | 64°F (18°C) | 79°F (26°C) | 0.2" | 0.0" | 0.0 | 27.3 |
| August | 97°F (36°C) | 64°F (18°C) | 80°F (27°C) | 0.1" | 0.0" | 0.0 | 28.9 |
| September | 92°F (33°C) | 61°F (16°C) | 76°F (25°C) | 0.3" | 0.0" | 0.0 | 21.8 |
| October | 82°F (28°C) | 53°F (12°C) | 68°F (20°C) | 0.5" | 0.0" | 0.1 | 10.4 |
| November | 73°F (23°C) | 44°F (7°C) | 59°F (15°C) | 0.8" | 0.0" | 1.2 | 1.7 |
| December | 65°F (18°C) | 39°F (4°C) | 52°F (11°C) | 1.9" | 0.0" | 6.6 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 2.7"
6.2 days with precipitation
February 2.8"
6.2 days with precipitation
March 1.7"
5.3 days with precipitation
April 0.8"
2.9 days with precipitation
May 0.5"
2.3 days with precipitation
June 0.1"
0.3 days with precipitation
July 0.2"
0.6 days with precipitation
August 0.1"
0.6 days with precipitation
September 0.3"
0.9 days with precipitation
October 0.5"
1.8 days with precipitation
November 0.8"
3.0 days with precipitation
December 1.9"
5.1 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
December 10
50% probability date
Last Spring Freeze
January 31
50% probability date
Growing Season
313 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,801
Higher = more heating needed
Cooling Degree Days
1,810
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
What San Jacinto's climate means for you
San Jacinto runs 65°F a year - peaking in August, coldest in December.
- Gardeners get about 313 frost-free days, with the last spring freeze near January 31 - plan the planting calendar around it, not the regional average.
- Energy bills track 1,801 heating and 1,810 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: San Jacinto, CA
Based on station USC00047813 feeding NOAA's 1991–2020 climate normals, San Jacinto, California averages 65°F a year, ranging from a mean daily high of 79°F to a mean daily low of 51°F. August is typically the warmest month of the year, while December is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. San Jacinto receives roughly 12.2 inches of precipitation each year, with negligible snowfall. The frost-free season averages 313 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 31 and the first fall freeze near December 10. For energy use, 1,801 heating degree days and 1,810 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, San Jacinto scores 90/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, August-driven heat peaks in summer, and December-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in San Jacinto, CA? ▼
The average annual temperature in San Jacinto, California is 65°F. The warmest month averages 97°F (36°C) and the coldest averages 39°F (4°C).
How much rain does San Jacinto get? ▼
San Jacinto receives 12.2 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for San Jacinto? ▼
San Jacinto has a climate comfort score of 90/100 (Excellent), milder than 94% of U.S. cities in the PlainClimate database.
When is the growing season in San Jacinto? ▼
San Jacinto has approximately 313 frost-free days per year, with the last spring freeze around January 31 and the first fall freeze around December 10.
How much energy does heating and cooling require in San Jacinto? ▼
San Jacinto has 1,801 heating degree days and 1,810 cooling degree days annually, a fairly balanced heating/cooling split. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this San Jacinto climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00047813 near San Jacinto.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00047813. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.