Climate Comfort Score
63/100
Good
NOAA 1991–2020 normals 56°F annual avg Public-domain federal data
Manassas, VA Climate
Explore average temperature, rainfall, and comfort score sourced from NOAA NCEI's 1991–2020 climate normals →
- 56°F
- Avg annual temp
- 63/100
- Comfort score
- 198d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Manassas
Manassas, Virginia averages 56°F a year and scores 63/100 on the comfort index - good, milder than 47% of U.S. cities.
- 56°F
- yearly average temperature, NOAA normal
- 63/100
- comfort score, milder than 47% of U.S. cities
- 198 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
56°F (13°C)
Avg High
66°F
Avg Low
46°F
Annual Precip
N/A
Comfort Score
63/100
Good
Avg Annual Temperature
56°F
30-year mean (NOAA NCEI)
Annual Precipitation
N/A
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Manassas) 63.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Manassas area.
How Manassas compares to every U.S. city
Manassas's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
63 Top 53% higher than 47% 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 Manassas
MethodologyManassas'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 | 42°F (6°C) | 24°F (-4°C) | 33°F (1°C) | N/A | 23.7 | 0.0 |
| February | 46°F (8°C) | 26°F (-3°C) | 36°F (2°C) | N/A | 20.6 | 0.0 |
| March | 54°F (12°C) | 32°F (0°C) | 43°F (6°C) | N/A | 14.6 | 0.0 |
| April | 66°F (19°C) | 43°F (6°C) | 55°F (13°C) | N/A | 1.9 | 0.3 |
| May | 74°F (23°C) | 54°F (12°C) | 64°F (18°C) | N/A | 0.0 | 1.8 |
| June | 83°F (28°C) | 64°F (18°C) | 73°F (23°C) | N/A | 0.0 | 7.2 |
| July | 88°F (31°C) | 69°F (20°C) | 78°F (26°C) | N/A | 0.0 | 16.8 |
| August | 85°F (30°C) | 67°F (19°C) | 76°F (24°C) | N/A | 0.0 | 10.8 |
| September | 78°F (26°C) | 58°F (15°C) | 68°F (20°C) | N/A | 0.0 | 3.3 |
| October | 67°F (19°C) | 46°F (8°C) | 56°F (13°C) | N/A | 1.6 | 0.3 |
| November | 56°F (14°C) | 35°F (2°C) | 46°F (8°C) | N/A | 11.5 | 0.0 |
| December | 47°F (8°C) | 29°F (-2°C) | 38°F (3°C) | N/A | 19.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January N/A
February N/A
March N/A
April N/A
May N/A
June N/A
July N/A
August N/A
September N/A
October N/A
November N/A
December N/A
Frost Dates & Growing Season
First Fall Freeze
October 27
50% probability date
Last Spring Freeze
April 12
50% probability date
Growing Season
198 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,707
Higher = more heating needed
Cooling Degree Days
1,270
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Manassas's climate means for you
Manassas runs 56°F a year - peaking in July, coldest in January.
- Gardeners get about 198 frost-free days, with the last spring freeze near April 12 - plan the planting calendar around it, not the regional average.
- Energy bills track 4,707 heating and 1,270 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: Manassas, VA
In Manassas, Virginia, the NOAA 1991–2020 climate normals put the annual average temperature at 56°F, ranging from a mean daily high of 66°F to a mean daily low of 46°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USC00445204, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Anyone planning to live, garden, or travel in Manassas should weigh precipitation alongside temperature: the annual average runs an uncharted amount, predominantly as rainfall. The frost-free season averages 198 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 12 and the first fall freeze near October 27. And on the energy front, 4,707 heating degree days and 1,270 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Manassas scores 63/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings July-driven heat, and deep winter brings January-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Manassas, VA? ▼
The average annual temperature in Manassas, Virginia is 56°F. The warmest month averages 88°F (31°C) and the coldest averages 24°F (-4°C).
How much rain does Manassas get? ▼
Manassas receives an unknown amount of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Manassas? ▼
Manassas has a climate comfort score of 63/100 (Good), milder than 47% of U.S. cities in the PlainClimate database.
When is the growing season in Manassas? ▼
Manassas has approximately 198 frost-free days per year, with the last spring freeze around April 12 and the first fall freeze around October 27.
How much energy does heating and cooling require in Manassas? ▼
Manassas has 4,707 heating degree days and 1,270 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 Manassas climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00445204 near Manassas.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00445204. 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.