Climate Comfort Score
89/100
Excellent
NOAA 1991–2020 normals 66°F annual avg Public-domain federal data
Pasadena, CA Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 66°F
- Avg annual temp
- 89/100
- Comfort score
- 20.1"
- Annual precip
- -1d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Pasadena
Pasadena, California averages 66°F a year and scores 89/100 on the comfort index - excellent, milder than 93% of U.S. cities.
- 66°F
- annual average temperature (NOAA normal)
- 89/100
- comfort score, milder than 93% of U.S. cities
- 20.1"
- precipitation, annual total
- -1 days
- frost-free days per growing season
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
20.1"
Annual Snow
0.0"
Comfort Score
89/100
Excellent
Avg Annual Temperature
66°F
30-year mean (NOAA NCEI)
Annual Precipitation
20.1"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Pasadena) 89.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Pasadena area.
How Pasadena compares to every U.S. city
Pasadena's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
89 Top 7% higher than 93% 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 Pasadena
MethodologyZooming out from Pasadena'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 | 68°F (20°C) | 46°F (8°C) | 57°F (14°C) | 4.5" | 0.0" | 0.0 | 0.0 |
| February | 69°F (21°C) | 46°F (8°C) | 58°F (14°C) | 5.2" | 0.0" | 0.0 | 0.4 |
| March | 73°F (23°C) | 48°F (9°C) | 61°F (16°C) | 3.0" | 0.0" | 0.0 | 0.9 |
| April | 76°F (25°C) | 51°F (10°C) | 63°F (17°C) | 1.1" | 0.0" | 0.0 | 2.7 |
| May | 78°F (26°C) | 54°F (12°C) | 66°F (19°C) | 0.5" | 0.0" | 0.0 | 3.4 |
| June | 84°F (29°C) | 58°F (14°C) | 71°F (22°C) | 0.2" | 0.0" | 0.0 | 6.3 |
| July | 89°F (32°C) | 62°F (17°C) | 76°F (24°C) | 0.1" | 0.0" | 0.0 | 15.4 |
| August | 91°F (33°C) | 63°F (17°C) | 77°F (25°C) | 0.0" | 0.0" | 0.0 | 19.4 |
| September | 90°F (32°C) | 62°F (16°C) | 76°F (24°C) | 0.2" | 0.0" | 0.0 | 15.9 |
| October | 83°F (28°C) | 56°F (13°C) | 70°F (21°C) | 0.8" | 0.0" | 0.0 | 8.1 |
| November | 75°F (24°C) | 50°F (10°C) | 62°F (17°C) | 1.1" | 0.0" | 0.0 | 1.5 |
| December | 67°F (20°C) | 45°F (7°C) | 56°F (13°C) | 3.3" | 0.0" | 0.0 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 4.5"
7.1 days with precipitation
February 5.2"
7.9 days with precipitation
March 3.0"
6.2 days with precipitation
April 1.1"
3.4 days with precipitation
May 0.5"
2.8 days with precipitation
June 0.2"
1.6 days with precipitation
July 0.1"
0.6 days with precipitation
August 0.0"
0.4 days with precipitation
September 0.2"
0.8 days with precipitation
October 0.8"
2.6 days with precipitation
November 1.1"
3.2 days with precipitation
December 3.3"
6.1 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
January 7
50% probability date
Last Spring Freeze
January 8
50% probability date
Growing Season
-1 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,236
Higher = more heating needed
Cooling Degree Days
1,604
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nearby Cities
San Gabriel Fire Dept, CA
66°F avg · 79/100 comfort
MT Wilson Cbs, CA
58°F avg · 78/100 comfort
Los Angeles Dwtn Usc Campus, CA
66°F avg · 77/100 comfort
Burbank Valley Pump Plt, CA
65°F avg · 90/100 comfort
Burbank Glendale Pasadena, CA
65°F avg · 74/100 comfort
Hawthorne Muni, CA
65°F avg · 77/100 comfort
What Pasadena's climate means for you
Pasadena runs 66°F a year - peaking in August, coldest in December.
- Gardeners get about -1 frost-free days, with the last spring freeze near January 8 - plan the planting calendar around it, not the regional average.
- Energy bills track 1,236 heating and 1,604 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: Pasadena, CA
Based on station USC00046719 feeding NOAA's 1991–2020 climate normals, Pasadena, California averages 66°F a year, ranging from a mean daily high of 79°F to a mean daily low of 53°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.
Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Pasadena sees about 20.1 inches of precipitation a year, with negligible snowfall. The frost-free season averages -1 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 8 and the first fall freeze near January 7. On the energy side, 1,236 heating degree days and 1,604 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Pasadena scores 89/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings August-driven heat, and deep winter brings December-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Pasadena, CA? ▼
The average annual temperature in Pasadena, California is 66°F. The warmest month averages 91°F (33°C) and the coldest averages 45°F (7°C).
How much rain does Pasadena get? ▼
Pasadena receives 20.1 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Pasadena? ▼
Pasadena has a climate comfort score of 89/100 (Excellent), milder than 93% of U.S. cities in the PlainClimate database.
When is the growing season in Pasadena? ▼
Pasadena has approximately -1 frost-free days per year, with the last spring freeze around January 8 and the first fall freeze around January 7.
How much energy does heating and cooling require in Pasadena? ▼
Pasadena has 1,236 heating degree days and 1,604 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 Pasadena climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00046719 near Pasadena.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00046719. 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.