Climate Comfort Score
85/100
Excellent
NOAA 1991–2020 normals 66°F annual avg Public-domain federal data
Porterville, CA Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 66°F
- Avg annual temp
- 85/100
- Comfort score
- 11.0"
- Annual precip
- 327d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Porterville
Porterville, California averages 66°F a year and scores 85/100 on the comfort index - excellent, milder than 89% of U.S. cities.
- 66°F
- average temperature, NOAA 1991-2020 normal
- 85/100
- comfort score, milder than 89% of U.S. cities
- 11.0"
- yearly precipitation total
- 327 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
66°F (19°C)
Avg High
79°F
Avg Low
53°F
Annual Precip
11.0"
Comfort Score
85/100
Excellent
Avg Annual Temperature
66°F
30-year mean (NOAA NCEI)
Annual Precipitation
11.0"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Porterville) 85.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Porterville area.
How Porterville compares to every U.S. city
Porterville's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
85 Top 11% higher than 89% 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 Porterville
MethodologyZooming out from Porterville'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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 59°F (15°C) | 40°F (4°C) | 49°F (10°C) | 2.1" | 5.6 | 0.0 |
| February | 65°F (18°C) | 43°F (6°C) | 54°F (12°C) | 1.9" | 1.5 | 0.0 |
| March | 71°F (21°C) | 47°F (8°C) | 59°F (15°C) | 2.0" | 0.2 | 0.1 |
| April | 76°F (24°C) | 50°F (10°C) | 63°F (17°C) | 0.9" | 0.1 | 2.9 |
| May | 84°F (29°C) | 56°F (13°C) | 70°F (21°C) | 0.3" | 0.0 | 10.3 |
| June | 93°F (34°C) | 63°F (17°C) | 78°F (25°C) | 0.1" | 0.0 | 20.8 |
| July | 98°F (37°C) | 68°F (20°C) | 83°F (29°C) | 0.1" | 0.0 | 29.5 |
| August | 97°F (36°C) | 67°F (19°C) | 82°F (28°C) | 0.0" | 0.0 | 28.8 |
| September | 92°F (34°C) | 62°F (17°C) | 77°F (25°C) | 0.1" | 0.0 | 22.1 |
| October | 82°F (28°C) | 53°F (12°C) | 68°F (20°C) | 0.6" | 0.0 | 7.5 |
| November | 68°F (20°C) | 44°F (7°C) | 56°F (13°C) | 0.9" | 1.4 | 0.0 |
| December | 59°F (15°C) | 39°F (4°C) | 49°F (9°C) | 1.9" | 6.5 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 2.1"
9.4 days with precipitation
February 1.9"
9.4 days with precipitation
March 2.0"
7.0 days with precipitation
April 0.9"
4.6 days with precipitation
May 0.3"
2.4 days with precipitation
June 0.1"
0.7 days with precipitation
July 0.1"
0.2 days with precipitation
August 0.0"
0.3 days with precipitation
September 0.1"
1.0 days with precipitation
October 0.6"
2.0 days with precipitation
November 0.9"
4.6 days with precipitation
December 1.9"
7.5 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
December 13
50% probability date
Last Spring Freeze
January 20
50% probability date
Growing Season
327 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,966
Higher = more heating needed
Cooling Degree Days
2,237
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
What Porterville's climate means for you
Porterville runs 66°F a year - peaking in July, coldest in December.
- Gardeners get about 327 frost-free days, with the last spring freeze near January 20 - plan the planting calendar around it, not the regional average.
- Energy bills track 1,966 heating and 2,237 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: Porterville, CA
An annual average temperature of 66°F, ranging from a mean daily high of 79°F to a mean daily low of 53°F is what the NOAA 1991–2020 climate normals report for Porterville, California. July is typically the warmest month of the year, while December is the coldest. That baseline comes from station USC00047077 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.
Beyond temperature, Porterville averages 11.0 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 327 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 20 and the first fall freeze near December 13. Turning to energy use, 1,966 heating degree days and 2,237 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Porterville scores 85/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for December-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Porterville, CA? ▼
The average annual temperature in Porterville, California is 66°F. The warmest month averages 98°F (37°C) and the coldest averages 39°F (4°C).
How much rain does Porterville get? ▼
Porterville receives 11.0 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Porterville? ▼
Porterville has a climate comfort score of 85/100 (Excellent), milder than 89% of U.S. cities in the PlainClimate database.
When is the growing season in Porterville? ▼
Porterville has approximately 327 frost-free days per year, with the last spring freeze around January 20 and the first fall freeze around December 13.
How much energy does heating and cooling require in Porterville? ▼
Porterville has 1,966 heating degree days and 2,237 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 Porterville climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00047077 near Porterville.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00047077. 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.