Climate Comfort Score
78/100
Good
NOAA 1991–2020 normals 55°F annual avg Public-domain federal data
MT Hamilton, CA Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 55°F
- Avg annual temp
- 78/100
- Comfort score
- 27.3"
- Annual precip
- 199d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for MT Hamilton
MT Hamilton, California averages 55°F a year and scores 78/100 on the comfort index - good, milder than 74% of U.S. cities.
- 55°F
- annual average temperature (NOAA normal)
- 78/100
- comfort score, milder than 74% of U.S. cities
- 27.3"
- annual precipitation · 18" snow
- 199 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
55°F (13°C)
Avg High
62°F
Avg Low
49°F
Annual Precip
27.3"
Annual Snow
18.1"
Comfort Score
78/100
Good
Avg Annual Temperature
55°F
30-year mean (NOAA NCEI)
Annual Precipitation
27.3"
Plus 18.1" of snow
Comfort score vs national 100-point ceiling (MT Hamilton) 78.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the MT Hamilton area.
How MT Hamilton compares to every U.S. city
MT Hamilton's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
78 Top 26% higher than 74% 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 MT Hamilton
MethodologyThe chart below traces how the U.S. land temperature anomaly has moved against the global mean since 1900. For MT Hamilton, the NOAA 1991-2020 normal captures average conditions across that spread - notably, the most recent decade runs warmer than the 30-year mean itself.
- 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 | 50°F (10°C) | 39°F (4°C) | 44°F (7°C) | 5.0" | 4.2" | 7.9 | 0.0 |
| February | 49°F (9°C) | 38°F (3°C) | 43°F (6°C) | 4.8" | 5.3" | 8.4 | 0.0 |
| March | 51°F (11°C) | 39°F (4°C) | 45°F (7°C) | 4.4" | 3.8" | 8.2 | 0.0 |
| April | 55°F (13°C) | 41°F (5°C) | 48°F (9°C) | 2.2" | 1.8" | 6.6 | 0.0 |
| May | 62°F (17°C) | 47°F (9°C) | 55°F (13°C) | 1.3" | 0.0" | 1.5 | 0.0 |
| June | 71°F (22°C) | 56°F (13°C) | 64°F (18°C) | 0.3" | 0.0" | 0.0 | 0.3 |
| July | 79°F (26°C) | 65°F (18°C) | 72°F (22°C) | 0.0" | 0.0" | 0.0 | 1.2 |
| August | 79°F (26°C) | 65°F (18°C) | 72°F (22°C) | 0.1" | 0.0" | 0.0 | 1.1 |
| September | 75°F (24°C) | 60°F (16°C) | 67°F (20°C) | 0.2" | 0.0" | 0.0 | 0.2 |
| October | 66°F (19°C) | 52°F (11°C) | 59°F (15°C) | 1.3" | 0.0" | 0.2 | 0.0 |
| November | 55°F (13°C) | 43°F (6°C) | 49°F (10°C) | 3.0" | 0.9" | 3.5 | 0.0 |
| December | 49°F (9°C) | 38°F (3°C) | 43°F (6°C) | 4.7" | 2.1" | 8.6 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 5.0"
Snow: 4.2"
12.1 days with precipitation
February 4.8"
Snow: 5.3"
11.9 days with precipitation
March 4.4"
Snow: 3.8"
11.2 days with precipitation
April 2.2"
Snow: 1.8"
8.4 days with precipitation
May 1.3"
5.5 days with precipitation
June 0.3"
2.0 days with precipitation
July 0.0"
0.1 days with precipitation
August 0.1"
0.5 days with precipitation
September 0.2"
1.6 days with precipitation
October 1.3"
4.3 days with precipitation
November 3.0"
Snow: 0.9"
8.5 days with precipitation
December 4.7"
Snow: 2.1"
12.1 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 18
50% probability date
Last Spring Freeze
May 3
50% probability date
Growing Season
199 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,386
Higher = more heating needed
Cooling Degree Days
797
Higher = more cooling needed
Warmest Month
July
Coldest Month
February
What MT Hamilton's climate means for you
MT Hamilton runs 55°F a year - peaking in July, coldest in February.
- Gardeners get about 199 frost-free days, with the last spring freeze near May 3 - plan the planting calendar around it, not the regional average.
- Energy bills track 4,386 heating and 797 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: MT Hamilton, CA
Based on station USC00045933 feeding NOAA's 1991–2020 climate normals, MT Hamilton, California averages 55°F a year, ranging from a mean daily high of 62°F to a mean daily low of 49°F. July is typically the warmest month of the year, while February 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.
MT Hamilton averages 27.3 inches of precipitation a year, with 18.1 inches typically falling as snow, and that matters as much to daily life here as temperature does. The frost-free season averages 199 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 3 and the first fall freeze near November 18. As for energy demand, 4,386 heating degree days and 797 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, MT Hamilton scores 78/100 (Good), 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 July-driven heat, and deep winter brings February-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 MT Hamilton, CA? ▼
The average annual temperature in MT Hamilton, California is 55°F. The warmest month averages 79°F (26°C) and the coldest averages 38°F (3°C).
How much rain does MT Hamilton get? ▼
MT Hamilton receives 27.3 inches of precipitation annually, including 18.1 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for MT Hamilton? ▼
MT Hamilton has a climate comfort score of 78/100 (Good), milder than 74% of U.S. cities in the PlainClimate database.
When is the growing season in MT Hamilton? ▼
MT Hamilton has approximately 199 frost-free days per year, with the last spring freeze around May 3 and the first fall freeze around November 18.
How much energy does heating and cooling require in MT Hamilton? ▼
MT Hamilton has 4,386 heating degree days and 797 cooling degree days annually, a heating-dominated climate. 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 MT Hamilton climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00045933 near MT Hamilton.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00045933. 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.