Climate Comfort Score
68/100
Good
NOAA 1991–2020 normals 51°F annual avg Public-domain federal data
Chatham Muni, MA Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 51°F
- Avg annual temp
- 68/100
- Comfort score
- 45.2"
- Annual precip
- 205d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Chatham Muni
Chatham Muni, Massachusetts averages 51°F a year and scores 68/100 on the comfort index - good, milder than 58% of U.S. cities.
- 51°F
- annual average temperature (NOAA normal)
- 68/100
- comfort score, milder than 58% of U.S. cities
- 45.2"
- precipitation, annual total
- 205 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
51°F (11°C)
Avg High
58°F
Avg Low
44°F
Annual Precip
45.2"
Comfort Score
68/100
Good
Avg Annual Temperature
51°F
30-year mean (NOAA NCEI)
Annual Precipitation
45.2"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Chatham Muni) 68.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Chatham Muni area.
How Chatham Muni compares to every U.S. city
Chatham Muni'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 Chatham Muni
MethodologySince 1900, U.S. land temperatures have tracked (and diverged from) the global mean - the chart below shows how. Chatham Muni's current NOAA 1991-2020 normal sits within that longer spread, and the most recent decade runs 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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 39°F (4°C) | 26°F (-4°C) | 32°F (0°C) | 3.8" | 22.9 | 0.0 |
| February | 40°F (4°C) | 26°F (-3°C) | 33°F (0°C) | 3.6" | 21.5 | 0.0 |
| March | 44°F (7°C) | 31°F (0°C) | 38°F (3°C) | 4.4" | 17.1 | 0.0 |
| April | 52°F (11°C) | 39°F (4°C) | 46°F (8°C) | 4.0" | 3.6 | 0.0 |
| May | 62°F (17°C) | 48°F (9°C) | 55°F (13°C) | 3.3" | 0.1 | 0.0 |
| June | 72°F (22°C) | 57°F (14°C) | 64°F (18°C) | 3.0" | 0.0 | 0.3 |
| July | 79°F (26°C) | 64°F (18°C) | 71°F (22°C) | 2.8" | 0.0 | 0.8 |
| August | 78°F (25°C) | 64°F (18°C) | 71°F (21°C) | 3.0" | 0.0 | 0.2 |
| September | 71°F (22°C) | 58°F (14°C) | 64°F (18°C) | 3.6" | 0.0 | 0.0 |
| October | 61°F (16°C) | 47°F (9°C) | 54°F (12°C) | 4.2" | 0.8 | 0.0 |
| November | 52°F (11°C) | 39°F (4°C) | 45°F (7°C) | 4.5" | 7.5 | 0.0 |
| December | 44°F (7°C) | 31°F (-1°C) | 37°F (3°C) | 5.0" | 18.6 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 3.8"
14.4 days with precipitation
February 3.6"
12.6 days with precipitation
March 4.4"
12.5 days with precipitation
April 4.0"
13.7 days with precipitation
May 3.3"
12.9 days with precipitation
June 3.0"
12.5 days with precipitation
July 2.8"
11.4 days with precipitation
August 3.0"
11.4 days with precipitation
September 3.6"
12.8 days with precipitation
October 4.2"
14.2 days with precipitation
November 4.5"
12.5 days with precipitation
December 5.0"
14.2 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 4
50% probability date
Last Spring Freeze
April 13
50% probability date
Growing Season
205 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,622
Higher = more heating needed
Cooling Degree Days
512
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Chatham Muni's climate means for you
Chatham Muni runs 51°F a year - peaking in July, coldest in January.
- Gardeners get about 205 frost-free days, with the last spring freeze near April 13 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,622 heating and 512 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: Chatham Muni, MA
An annual average temperature of 51°F, ranging from a mean daily high of 58°F to a mean daily low of 44°F is what the NOAA 1991–2020 climate normals report for Chatham Muni, Massachusetts. July is typically the warmest month of the year, while January is the coldest. That baseline comes from station USW00094624 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.
Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Chatham Muni sees about 45.2 inches of precipitation a year, predominantly as rainfall. The frost-free season averages 205 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 13 and the first fall freeze near November 4. On the energy side, 5,622 heating degree days and 512 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Chatham Muni scores 68/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Chatham Muni, MA? ▼
The average annual temperature in Chatham Muni, Massachusetts is 51°F. The warmest month averages 79°F (26°C) and the coldest averages 26°F (-4°C).
How much rain does Chatham Muni get? ▼
Chatham Muni receives 45.2 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Chatham Muni? ▼
Chatham Muni 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 Chatham Muni? ▼
Chatham Muni has approximately 205 frost-free days per year, with the last spring freeze around April 13 and the first fall freeze around November 4.
How much energy does heating and cooling require in Chatham Muni? ▼
Chatham Muni has 5,622 heating degree days and 512 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 Chatham Muni climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00094624 near Chatham Muni.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00094624. 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.