Climate Comfort Score
77/100
Good
2026 data Public-data reference. official source
MT Hamilton, CA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 1 weather station (1991-2020).
MT Hamilton, California has an average annual temperature of 55°F and a climate comfort score of 77/100 (Good). Annual precipitation totals 27.3", including 18.1" of snow. Based on NOAA 30-year normals (1991–2020).
Avg Temperature
55°F (13°C)
Avg High
62°F
Avg Low
49°F
Annual Precip
27.3"
Annual Snow
18.1"
Comfort Score
77/100
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) 77.0%
National median (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the MT Hamilton area.
Warming context for MT Hamilton
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for MT Hamilton captures average conditions across the spread shown — the most recent decade is warmer than the 30-year mean.
- 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
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
Related Data
PlainEnviro
EPA environmental data — pollution, water quality, and environmental health by location
PlainCarbon
Carbon emissions data — greenhouse gas reporting and facility-level CO2 data
PlainHazard
Natural disaster data — weather-related hazards, FEMA declarations, and risk profiles
PlainAirData
EPA air quality data — AQI readings, pollutant levels, and air quality trends
Climate Guides
Climate Insight: MT Hamilton, CA
The NOAA 1991–2020 climate normals describe MT Hamilton, California as a location with an annual average temperature of 55°F, 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. These thirty-year averages, computed from station USC00045933, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. MT Hamilton receives roughly 27.3 inches of precipitation each year, with 18.1 inches typically falling as snow. Growing-season length varies with elevation and microclimate, with the last spring freeze near May 3 and the first fall freeze near November 18. For energy use, 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 77/100 (Good), 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 February-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 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 77/100 (Good). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
When is the growing season in MT Hamilton? ▼
Growing season data is not available for MT Hamilton.
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. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this MT Hamilton climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from weather station USC00045933. These 30-year averages are the standard reference for typical weather conditions.
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
