Climate Comfort Score
64/100
Good
NOAA 1991–2020 normals 48°F annual avg Public-domain federal data
Marshalltown Muni, IA Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 48°F
- Avg annual temp
- 64/100
- Comfort score
- 32.8"
- Annual precip
- 159d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Marshalltown Muni
Marshalltown Muni, Iowa averages 48°F a year and scores 64/100 on the comfort index - good, milder than 51% of U.S. cities.
- 48°F
- yearly average temperature, NOAA normal
- 64/100
- comfort score, milder than 51% of U.S. cities
- 32.8"
- yearly precipitation total
- 159 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
48°F (9°C)
Avg High
58°F
Avg Low
37°F
Annual Precip
32.8"
Comfort Score
64/100
Good
Avg Annual Temperature
48°F
30-year mean (NOAA NCEI)
Annual Precipitation
32.8"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Marshalltown Muni) 64.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Marshalltown Muni area.
How Marshalltown Muni compares to every U.S. city
Marshalltown Muni's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
64 Top 49% higher than 51% 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 Marshalltown Muni
MethodologyMarshalltown Muni's NOAA 1991-2020 normal sits inside a longer story: U.S. land temperatures have been tracking (and drifting from) the global mean since 1900, and the chart below shows that spread, with the most recent decade running 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 | 28°F (-2°C) | 10°F (-12°C) | 19°F (-7°C) | 0.8" | 30.3 | 0.0 |
| February | 32°F (0°C) | 14°F (-10°C) | 23°F (-5°C) | 0.5" | 26.3 | 0.0 |
| March | 46°F (8°C) | 26°F (-4°C) | 36°F (2°C) | 1.6" | 23.4 | 0.0 |
| April | 60°F (16°C) | 37°F (3°C) | 48°F (9°C) | 3.7" | 9.3 | 0.0 |
| May | 71°F (22°C) | 49°F (9°C) | 60°F (16°C) | 4.9" | 1.2 | 0.7 |
| June | 81°F (27°C) | 59°F (15°C) | 70°F (21°C) | 5.3" | 0.0 | 2.6 |
| July | 83°F (28°C) | 62°F (17°C) | 73°F (23°C) | 3.7" | 0.0 | 4.6 |
| August | 81°F (27°C) | 60°F (15°C) | 70°F (21°C) | 3.9" | 0.0 | 2.5 |
| September | 75°F (24°C) | 51°F (10°C) | 63°F (17°C) | 3.2" | 0.5 | 1.5 |
| October | 62°F (17°C) | 39°F (4°C) | 50°F (10°C) | 2.5" | 8.5 | 0.0 |
| November | 46°F (8°C) | 26°F (-3°C) | 36°F (2°C) | 1.7" | 21.2 | 0.0 |
| December | 33°F (1°C) | 16°F (-9°C) | 24°F (-4°C) | 1.0" | 28.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 0.8"
4.8 days with precipitation
February 0.5"
5.1 days with precipitation
March 1.6"
8.2 days with precipitation
April 3.7"
11.2 days with precipitation
May 4.9"
13.3 days with precipitation
June 5.3"
12.7 days with precipitation
July 3.7"
10.0 days with precipitation
August 3.9"
12.4 days with precipitation
September 3.2"
9.7 days with precipitation
October 2.5"
9.5 days with precipitation
November 1.7"
6.8 days with precipitation
December 1.0"
6.4 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 6
50% probability date
Last Spring Freeze
April 30
50% probability date
Growing Season
159 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,996
Higher = more heating needed
Cooling Degree Days
727
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Marshalltown Muni's climate means for you
Marshalltown Muni runs 48°F a year - peaking in July, coldest in January.
- Gardeners get about 159 frost-free days, with the last spring freeze near April 30 - plan the planting calendar around it, not the regional average.
- Energy bills track 6,996 heating and 727 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: Marshalltown Muni, IA
In Marshalltown Muni, Iowa, the NOAA 1991–2020 climate normals put the annual average temperature at 48°F, ranging from a mean daily high of 58°F to a mean daily low of 37°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USW00094988, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Marshalltown Muni averages 32.8 inches of precipitation a year, predominantly as rainfall, and that matters as much to daily life here as temperature does. The frost-free season averages 159 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 30 and the first fall freeze near October 6. As for energy demand, 6,996 heating degree days and 727 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Marshalltown Muni scores 64/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.
Frequently Asked Questions
What is the average temperature in Marshalltown Muni, IA? ▼
The average annual temperature in Marshalltown Muni, Iowa is 48°F. The warmest month averages 83°F (28°C) and the coldest averages 10°F (-12°C).
How much rain does Marshalltown Muni get? ▼
Marshalltown Muni receives 32.8 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Marshalltown Muni? ▼
Marshalltown Muni has a climate comfort score of 64/100 (Good), milder than 51% of U.S. cities in the PlainClimate database.
When is the growing season in Marshalltown Muni? ▼
Marshalltown Muni has approximately 159 frost-free days per year, with the last spring freeze around April 30 and the first fall freeze around October 6.
How much energy does heating and cooling require in Marshalltown Muni? ▼
Marshalltown Muni has 6,996 heating degree days and 727 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 Marshalltown Muni climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00094988 near Marshalltown Muni.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00094988. 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.