Climate Comfort Score
64/100
Good
NOAA 1991–2020 normals 49°F annual avg Public-domain federal data
Sigourney, IA Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 49°F
- Avg annual temp
- 64/100
- Comfort score
- 37.4"
- Annual precip
- 174d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Sigourney
Sigourney, Iowa averages 49°F a year and scores 64/100 on the comfort index - good, milder than 51% of U.S. cities.
- 49°F
- yearly average temperature, NOAA normal
- 64/100
- comfort score, milder than 51% of U.S. cities
- 37.4"
- yearly precipitation total
- 174 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
49°F (9°C)
Avg High
60°F
Avg Low
38°F
Annual Precip
37.4"
Comfort Score
64/100
Good
Avg Annual Temperature
49°F
30-year mean (NOAA NCEI)
Annual Precipitation
37.4"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Sigourney) 64.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Sigourney area.
How Sigourney compares to every U.S. city
Sigourney'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 Sigourney
MethodologyThe chart below traces how the U.S. land temperature anomaly has moved against the global mean since 1900. For Sigourney, 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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 30°F (-1°C) | 12°F (-11°C) | 21°F (-6°C) | 1.2" | 30.1 | 0.0 |
| February | 35°F (1°C) | 15°F (-9°C) | 25°F (-4°C) | 1.5" | 25.8 | 0.0 |
| March | 48°F (9°C) | 26°F (-3°C) | 37°F (3°C) | 2.3" | 22.8 | 0.0 |
| April | 61°F (16°C) | 37°F (3°C) | 49°F (9°C) | 3.7" | 8.1 | 0.0 |
| May | 71°F (22°C) | 49°F (10°C) | 60°F (16°C) | 5.0" | 0.4 | 0.2 |
| June | 81°F (27°C) | 59°F (15°C) | 70°F (21°C) | 5.1" | 0.0 | 2.3 |
| July | 85°F (29°C) | 63°F (17°C) | 74°F (23°C) | 3.9" | 0.0 | 7.1 |
| August | 83°F (28°C) | 60°F (16°C) | 72°F (22°C) | 4.8" | 0.0 | 4.4 |
| September | 76°F (25°C) | 52°F (11°C) | 64°F (18°C) | 3.5" | 0.1 | 1.7 |
| October | 63°F (17°C) | 40°F (4°C) | 52°F (11°C) | 2.8" | 6.4 | 0.1 |
| November | 48°F (9°C) | 28°F (-2°C) | 38°F (3°C) | 2.2" | 19.7 | 0.0 |
| December | 35°F (2°C) | 18°F (-8°C) | 27°F (-3°C) | 1.5" | 28.6 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 1.2"
5.7 days with precipitation
February 1.5"
6.4 days with precipitation
March 2.3"
7.3 days with precipitation
April 3.7"
9.4 days with precipitation
May 5.0"
11.8 days with precipitation
June 5.1"
11.6 days with precipitation
July 3.9"
8.2 days with precipitation
August 4.8"
8.8 days with precipitation
September 3.5"
7.4 days with precipitation
October 2.8"
7.6 days with precipitation
November 2.2"
6.5 days with precipitation
December 1.5"
5.9 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 15
50% probability date
Last Spring Freeze
April 24
50% probability date
Growing Season
174 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,641
Higher = more heating needed
Cooling Degree Days
806
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Sigourney's climate means for you
Sigourney runs 49°F a year - peaking in July, coldest in January.
- Gardeners get about 174 frost-free days, with the last spring freeze near April 24 - plan the planting calendar around it, not the regional average.
- Energy bills track 6,641 heating and 806 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: Sigourney, IA
Sigourney, Iowa runs an annual average of 49°F, ranging from a mean daily high of 60°F to a mean daily low of 38°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USC00137678, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Anyone planning to live, garden, or travel in Sigourney should weigh precipitation alongside temperature: the annual average runs 37.4 inches, predominantly as rainfall. The frost-free season averages 174 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 24 and the first fall freeze near October 15. And on the energy front, 6,641 heating degree days and 806 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Sigourney 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 Sigourney, IA? ▼
The average annual temperature in Sigourney, Iowa is 49°F. The warmest month averages 85°F (29°C) and the coldest averages 12°F (-11°C).
How much rain does Sigourney get? ▼
Sigourney receives 37.4 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Sigourney? ▼
Sigourney 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 Sigourney? ▼
Sigourney has approximately 174 frost-free days per year, with the last spring freeze around April 24 and the first fall freeze around October 15.
How much energy does heating and cooling require in Sigourney? ▼
Sigourney has 6,641 heating degree days and 806 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 Sigourney climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00137678 near Sigourney.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00137678. 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.