Climate Comfort Score
68/100
Good
NOAA 1991–2020 normals 56°F annual avg Public-domain federal data
Grass Valley, CA Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 56°F
- Avg annual temp
- 68/100
- Comfort score
- 53.2"
- Annual precip
- 217d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Grass Valley
Grass Valley, California averages 56°F a year and scores 68/100 on the comfort index - good, milder than 58% of U.S. cities.
- 56°F
- yearly average temperature, NOAA normal
- 68/100
- comfort score, milder than 58% of U.S. cities
- 53.2"
- annual precipitation · 9" snow
- 217 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
56°F (13°C)
Avg High
69°F
Avg Low
44°F
Annual Precip
53.2"
Annual Snow
8.6"
Comfort Score
68/100
Good
Avg Annual Temperature
56°F
30-year mean (NOAA NCEI)
Annual Precipitation
53.2"
Plus 8.6" of snow
Comfort score vs national 100-point ceiling (Grass Valley) 68.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Grass Valley area.
How Grass Valley compares to every U.S. city
Grass Valley's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
68 Top 42% higher than 58% 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 Grass Valley
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Grass Valley 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 | 54°F (12°C) | 33°F (1°C) | 43°F (6°C) | 9.3" | 0.7" | 15.6 | 0.0 |
| February | 55°F (13°C) | 34°F (1°C) | 45°F (7°C) | 9.0" | 3.0" | 11.0 | 0.0 |
| March | 58°F (14°C) | 37°F (3°C) | 48°F (9°C) | 8.2" | 3.0" | 7.1 | 0.0 |
| April | 63°F (17°C) | 40°F (4°C) | 51°F (11°C) | 4.4" | 0.5" | 3.0 | 0.0 |
| May | 71°F (22°C) | 47°F (8°C) | 59°F (15°C) | 2.5" | 0.0" | 0.1 | 0.5 |
| June | 80°F (27°C) | 53°F (11°C) | 66°F (19°C) | 0.7" | 0.0" | 0.0 | 4.6 |
| July | 88°F (31°C) | 58°F (15°C) | 73°F (23°C) | 0.0" | 0.0" | 0.0 | 13.5 |
| August | 87°F (31°C) | 57°F (14°C) | 72°F (22°C) | 0.1" | 0.0" | 0.0 | 11.8 |
| September | 82°F (28°C) | 52°F (11°C) | 67°F (20°C) | 0.4" | 0.0" | 0.0 | 5.3 |
| October | 72°F (22°C) | 44°F (7°C) | 58°F (15°C) | 2.6" | 0.0" | 0.5 | 0.7 |
| November | 60°F (15°C) | 37°F (3°C) | 48°F (9°C) | 5.5" | 0.2" | 6.9 | 0.0 |
| December | 53°F (11°C) | 33°F (0°C) | 43°F (6°C) | 10.5" | 1.2" | 17.2 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 9.3"
Snow: 0.7"
12.8 days with precipitation
February 9.0"
Snow: 3.0"
11.7 days with precipitation
March 8.2"
Snow: 3.0"
12.2 days with precipitation
April 4.4"
Snow: 0.5"
8.5 days with precipitation
May 2.5"
5.9 days with precipitation
June 0.7"
2.7 days with precipitation
July 0.0"
0.2 days with precipitation
August 0.1"
0.8 days with precipitation
September 0.4"
1.6 days with precipitation
October 2.6"
4.4 days with precipitation
November 5.5"
Snow: 0.2"
8.4 days with precipitation
December 10.5"
Snow: 1.2"
12.3 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 13
50% probability date
Last Spring Freeze
April 10
50% probability date
Growing Season
217 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
3,963
Higher = more heating needed
Cooling Degree Days
749
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
What Grass Valley's climate means for you
Grass Valley runs 56°F a year - peaking in July, coldest in December.
- Gardeners get about 217 frost-free days, with the last spring freeze near April 10 - plan the planting calendar around it, not the regional average.
- Energy bills track 3,963 heating and 749 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: Grass Valley, CA
The NOAA 1991–2020 climate normals describe Grass Valley, California as a location with an annual average temperature of 56°F, ranging from a mean daily high of 69°F to a mean daily low of 44°F. July is typically the warmest month of the year, while December is the coldest. These thirty-year averages, computed from station USC00043573, 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. Grass Valley receives roughly 53.2 inches of precipitation each year, with 8.6 inches typically falling as snow. The frost-free season averages 217 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 10 and the first fall freeze near November 13. For energy use, 3,963 heating degree days and 749 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Grass Valley scores 68/100 (Good), 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, July-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 Grass Valley, CA? ▼
The average annual temperature in Grass Valley, California is 56°F. The warmest month averages 88°F (31°C) and the coldest averages 33°F (0°C).
How much rain does Grass Valley get? ▼
Grass Valley receives 53.2 inches of precipitation annually, including 8.6 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Grass Valley? ▼
Grass Valley has a climate comfort score of 68/100 (Good), milder than 58% of U.S. cities in the PlainClimate database.
When is the growing season in Grass Valley? ▼
Grass Valley has approximately 217 frost-free days per year, with the last spring freeze around April 10 and the first fall freeze around November 13.
How much energy does heating and cooling require in Grass Valley? ▼
Grass Valley has 3,963 heating degree days and 749 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 Grass Valley climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00043573 near Grass Valley.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00043573. 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.