Climate Comfort Score
44/100
Moderate
NOAA 1991–2020 normals 39°F annual avg Public-domain federal data
Westby, MT Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 39°F
- Avg annual temp
- 44/100
- Comfort score
- 14.9"
- Annual precip
- 126d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Westby
Westby, Montana averages 39°F a year and scores 44/100 on the comfort index - moderate, milder than 8% of U.S. cities.
- 39°F
- yearly average temperature, NOAA normal
- 44/100
- comfort score, milder than 8% of U.S. cities
- 14.9"
- annual precipitation
- 126 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
39°F (4°C)
Avg High
51°F
Avg Low
27°F
Annual Precip
14.9"
Comfort Score
44/100
Moderate
Avg Annual Temperature
39°F
30-year mean (NOAA NCEI)
Annual Precipitation
14.9"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Westby) 44.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Westby area.
How Westby compares to every U.S. city
Westby'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 Westby
MethodologyZooming out from Westby'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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 20°F (-7°C) | -2°F (-19°C) | 9°F (-13°C) | 0.4" | 31.0 | 0.0 |
| February | 24°F (-5°C) | 2°F (-17°C) | 13°F (-11°C) | 0.3" | 27.9 | 0.0 |
| March | 36°F (2°C) | 14°F (-10°C) | 25°F (-4°C) | 0.6" | 29.9 | 0.0 |
| April | 53°F (11°C) | 27°F (-3°C) | 40°F (4°C) | 1.0" | 21.7 | 0.0 |
| May | 65°F (19°C) | 40°F (4°C) | 52°F (11°C) | 2.2" | 6.6 | 0.1 |
| June | 73°F (23°C) | 50°F (10°C) | 62°F (16°C) | 3.1" | 0.1 | 0.8 |
| July | 80°F (27°C) | 55°F (13°C) | 67°F (20°C) | 2.5" | 0.0 | 3.1 |
| August | 80°F (27°C) | 52°F (11°C) | 66°F (19°C) | 1.6" | 0.0 | 4.3 |
| September | 70°F (21°C) | 41°F (5°C) | 55°F (13°C) | 1.3" | 4.2 | 1.3 |
| October | 54°F (12°C) | 29°F (-2°C) | 41°F (5°C) | 1.0" | 21.0 | 0.0 |
| November | 36°F (2°C) | 15°F (-10°C) | 25°F (-4°C) | 0.5" | 28.9 | 0.0 |
| December | 24°F (-5°C) | 4°F (-16°C) | 14°F (-10°C) | 0.5" | 30.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 0.4"
February 0.3"
March 0.6"
April 1.0"
May 2.2"
June 3.1"
July 2.5"
August 1.6"
September 1.3"
October 1.0"
November 0.5"
December 0.5"
Frost Dates & Growing Season
First Fall Freeze
September 21
50% probability date
Last Spring Freeze
May 18
50% probability date
Growing Season
126 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
9,695
Higher = more heating needed
Cooling Degree Days
286
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Westby's climate means for you
Westby runs 39°F a year - peaking in July, coldest in January.
- Gardeners get about 126 frost-free days, with the last spring freeze near May 18 - plan the planting calendar around it, not the regional average.
- Energy bills track 9,695 heating and 286 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: Westby, MT
Westby, Montana runs an annual average of 39°F, ranging from a mean daily high of 51°F to a mean daily low of 27°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 USC00248777, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Beyond temperature, Westby averages 14.9 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 126 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 18 and the first fall freeze near September 21. Turning to energy use, 9,695 heating degree days and 286 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Westby scores 44/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, July-driven heat peaks in summer, and January-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in Westby, MT? ▼
The average annual temperature in Westby, Montana is 39°F. The warmest month averages 80°F (27°C) and the coldest averages -2°F (-19°C).
How much rain does Westby get? ▼
Westby receives 14.9 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Westby? ▼
Westby 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 Westby? ▼
Westby has approximately 126 frost-free days per year, with the last spring freeze around May 18 and the first fall freeze around September 21.
How much energy does heating and cooling require in Westby? ▼
Westby has 9,695 heating degree days and 286 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 Westby climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00248777 near Westby.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00248777. 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.