Climate Comfort Score
49/100
Moderate
NOAA 1991–2020 normals 44°F annual avg Public-domain federal data
Roy Lake, SD Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 44°F
- Avg annual temp
- 49/100
- Comfort score
- 25.0"
- Annual precip
- 160d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Roy Lake
Roy Lake, South Dakota averages 44°F a year and scores 49/100 on the comfort index - moderate, milder than 18% of U.S. cities.
- 44°F
- yearly average temperature, NOAA normal
- 49/100
- comfort score, milder than 18% of U.S. cities
- 25.0"
- annual precipitation · 48" snow
- 160 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
44°F (6°C)
Avg High
53°F
Avg Low
34°F
Annual Precip
25.0"
Annual Snow
48.1"
Comfort Score
49/100
Moderate
Avg Annual Temperature
44°F
30-year mean (NOAA NCEI)
Annual Precipitation
25.0"
Plus 48.1" of snow
Comfort score vs national 100-point ceiling (Roy Lake) 49.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Roy Lake area.
How Roy Lake compares to every U.S. city
Roy Lake's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
49 Top 82% higher than 18% 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 Roy Lake
MethodologyZooming out from Roy Lake's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- 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 | 22°F (-6°C) | 3°F (-16°C) | 12°F (-11°C) | 0.6" | 6.6" | 30.9 | 0.0 |
| February | 26°F (-4°C) | 5°F (-15°C) | 15°F (-9°C) | 0.6" | 9.2" | 27.8 | 0.0 |
| March | 38°F (3°C) | 18°F (-8°C) | 28°F (-2°C) | 1.0" | 7.0" | 28.5 | 0.0 |
| April | 53°F (12°C) | 32°F (0°C) | 42°F (6°C) | 2.1" | 7.2" | 16.4 | 0.0 |
| May | 67°F (19°C) | 46°F (8°C) | 56°F (14°C) | 3.1" | 0.2" | 3.2 | 0.2 |
| June | 76°F (25°C) | 58°F (14°C) | 67°F (19°C) | 4.3" | 0.0" | 0.0 | 0.2 |
| July | 82°F (28°C) | 62°F (17°C) | 72°F (22°C) | 4.4" | 0.0" | 0.0 | 1.9 |
| August | 81°F (27°C) | 60°F (16°C) | 70°F (21°C) | 2.6" | 0.0" | 0.0 | 1.3 |
| September | 72°F (22°C) | 51°F (11°C) | 61°F (16°C) | 2.5" | 0.0" | 0.5 | 0.1 |
| October | 57°F (14°C) | 37°F (3°C) | 47°F (8°C) | 2.2" | 2.5" | 11.2 | 0.0 |
| November | 40°F (5°C) | 23°F (-5°C) | 32°F (0°C) | 0.8" | 4.3" | 24.9 | 0.0 |
| December | 27°F (-3°C) | 10°F (-12°C) | 18°F (-8°C) | 0.8" | 11.1" | 30.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 0.6"
Snow: 6.6"
5.0 days with precipitation
February 0.6"
Snow: 9.2"
5.1 days with precipitation
March 1.0"
Snow: 7.0"
4.9 days with precipitation
April 2.1"
Snow: 7.2"
6.9 days with precipitation
May 3.1"
Snow: 0.2"
10.6 days with precipitation
June 4.3"
11.2 days with precipitation
July 4.4"
8.5 days with precipitation
August 2.6"
7.9 days with precipitation
September 2.5"
7.6 days with precipitation
October 2.2"
Snow: 2.5"
7.2 days with precipitation
November 0.8"
Snow: 4.3"
3.8 days with precipitation
December 0.8"
Snow: 11.1"
5.5 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 9
50% probability date
Last Spring Freeze
May 2
50% probability date
Growing Season
160 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,417
Higher = more heating needed
Cooling Degree Days
619
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Roy Lake's climate means for you
Roy Lake runs 44°F a year - peaking in July, coldest in January.
- Gardeners get about 160 frost-free days, with the last spring freeze near May 2 - plan the planting calendar around it, not the regional average.
- Energy bills track 8,417 heating and 619 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: Roy Lake, SD
An annual average temperature of 44°F, ranging from a mean daily high of 53°F to a mean daily low of 34°F is what the NOAA 1991–2020 climate normals report for Roy Lake, South Dakota. July is typically the warmest month of the year, while January is the coldest. That baseline comes from station USC00397326 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. Roy Lake sees about 25.0 inches of precipitation a year, with 48.1 inches typically falling as snow. The frost-free season averages 160 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 2 and the first fall freeze near October 9. On the energy side, 8,417 heating degree days and 619 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Roy Lake scores 49/100 (Moderate), 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 January-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 Roy Lake, SD? ▼
The average annual temperature in Roy Lake, South Dakota is 44°F. The warmest month averages 82°F (28°C) and the coldest averages 3°F (-16°C).
How much rain does Roy Lake get? ▼
Roy Lake receives 25.0 inches of precipitation annually, including 48.1 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Roy Lake? ▼
Roy Lake has a climate comfort score of 49/100 (Moderate), milder than 18% of U.S. cities in the PlainClimate database.
When is the growing season in Roy Lake? ▼
Roy Lake has approximately 160 frost-free days per year, with the last spring freeze around May 2 and the first fall freeze around October 9.
How much energy does heating and cooling require in Roy Lake? ▼
Roy Lake has 8,417 heating degree days and 619 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 Roy Lake climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00397326 near Roy Lake.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00397326. 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.