Climate Comfort Score
44/100
Moderate
NOAA 1991–2020 normals 44°F annual avg Public-domain federal data
Sun Rvr, MT Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 44°F
- Avg annual temp
- 44/100
- Comfort score
- 13.3"
- Annual precip
- 100d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Sun Rvr
Sun Rvr, Montana averages 44°F a year and scores 44/100 on the comfort index - moderate, milder than 8% of U.S. cities.
- 44°F
- yearly average temperature, NOAA normal
- 44/100
- comfort score, milder than 8% of U.S. cities
- 13.3"
- precipitation, annual total
- 100 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
44°F (6°C)
Avg High
58°F
Avg Low
29°F
Annual Precip
13.3"
Comfort Score
44/100
Moderate
Avg Annual Temperature
44°F
30-year mean (NOAA NCEI)
Annual Precipitation
13.3"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Sun Rvr) 44.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Sun Rvr area.
How Sun Rvr compares to every U.S. city
Sun Rvr's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
44 Top 92% higher than 8% 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 Sun Rvr
MethodologySun Rvr'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 | 38°F (3°C) | 13°F (-11°C) | 25°F (-4°C) | 0.4" | 26.1 | 0.0 |
| February | 39°F (4°C) | 13°F (-11°C) | 26°F (-3°C) | 0.5" | 24.7 | 0.0 |
| March | 47°F (8°C) | 20°F (-7°C) | 33°F (1°C) | 0.6" | 24.5 | 0.0 |
| April | 56°F (13°C) | 28°F (-2°C) | 42°F (6°C) | 1.7" | 18.6 | 0.0 |
| May | 65°F (18°C) | 36°F (2°C) | 51°F (10°C) | 2.2" | 7.8 | 0.1 |
| June | 73°F (23°C) | 44°F (6°C) | 58°F (15°C) | 2.7" | 0.4 | 1.2 |
| July | 83°F (29°C) | 48°F (9°C) | 66°F (19°C) | 1.1" | 0.0 | 8.4 |
| August | 82°F (28°C) | 47°F (8°C) | 64°F (18°C) | 1.0" | 0.2 | 6.9 |
| September | 72°F (22°C) | 40°F (4°C) | 56°F (13°C) | 1.3" | 3.6 | 1.3 |
| October | 58°F (14°C) | 31°F (-1°C) | 44°F (7°C) | 0.9" | 15.1 | 0.0 |
| November | 45°F (7°C) | 21°F (-6°C) | 33°F (1°C) | 0.6" | 22.4 | 0.0 |
| December | 37°F (3°C) | 14°F (-10°C) | 25°F (-4°C) | 0.4" | 26.7 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 0.4"
3.8 days with precipitation
February 0.5"
4.7 days with precipitation
March 0.6"
5.2 days with precipitation
April 1.7"
7.4 days with precipitation
May 2.2"
7.1 days with precipitation
June 2.7"
8.4 days with precipitation
July 1.1"
4.3 days with precipitation
August 1.0"
4.0 days with precipitation
September 1.3"
4.6 days with precipitation
October 0.9"
4.6 days with precipitation
November 0.6"
4.2 days with precipitation
December 0.4"
3.5 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
September 10
50% probability date
Last Spring Freeze
June 2
50% probability date
Growing Season
100 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,940
Higher = more heating needed
Cooling Degree Days
178
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Sun Rvr's climate means for you
Sun Rvr runs 44°F a year - peaking in July, coldest in January.
- Gardeners get about 100 frost-free days, with the last spring freeze near June 2 - plan the planting calendar around it, not the regional average.
- Energy bills track 7,940 heating and 178 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: Sun Rvr, MT
Based on station USC00248021 feeding NOAA's 1991–2020 climate normals, Sun Rvr, Montana averages 44°F a year, ranging from a mean daily high of 58°F to a mean daily low of 29°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.
Beyond temperature, Sun Rvr averages 13.3 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 100 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near June 2 and the first fall freeze near September 10. Turning to energy use, 7,940 heating degree days and 178 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Sun Rvr scores 44/100 (Moderate), 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 Sun Rvr, MT? ▼
The average annual temperature in Sun Rvr, Montana is 44°F. The warmest month averages 83°F (29°C) and the coldest averages 13°F (-11°C).
How much rain does Sun Rvr get? ▼
Sun Rvr receives 13.3 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Sun Rvr? ▼
Sun Rvr has a climate comfort score of 44/100 (Moderate), milder than 8% of U.S. cities in the PlainClimate database.
When is the growing season in Sun Rvr? ▼
Sun Rvr has approximately 100 frost-free days per year, with the last spring freeze around June 2 and the first fall freeze around September 10.
How much energy does heating and cooling require in Sun Rvr? ▼
Sun Rvr has 7,940 heating degree days and 178 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 Sun Rvr climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00248021 near Sun Rvr.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00248021. 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.