Climate Comfort Score
49/100
Moderate
NOAA 1991–2020 normals 48°F annual avg Public-domain federal data
Rockville, OR Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 48°F
- Avg annual temp
- 49/100
- Comfort score
- 108d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Rockville
Rockville, Oregon averages 48°F a year and scores 49/100 on the comfort index - moderate, milder than 18% of U.S. cities.
- 48°F
- annual average temperature (NOAA normal)
- 49/100
- comfort score, milder than 18% of U.S. cities
- 108 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
48°F (9°C)
Avg High
63°F
Avg Low
34°F
Annual Precip
N/A
Comfort Score
49/100
Moderate
Avg Annual Temperature
48°F
30-year mean (NOAA NCEI)
Annual Precipitation
N/A
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Rockville) 49.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Rockville area.
How Rockville compares to every U.S. city
Rockville'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 Rockville
MethodologyRockville'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 | 39°F (4°C) | 22°F (-6°C) | 30°F (-1°C) | N/A | 28.0 | 0.0 |
| February | 44°F (7°C) | 25°F (-4°C) | 34°F (1°C) | N/A | 24.7 | 0.0 |
| March | 54°F (12°C) | 28°F (-2°C) | 41°F (5°C) | N/A | 24.4 | 0.0 |
| April | 62°F (17°C) | 32°F (0°C) | 47°F (8°C) | N/A | 18.0 | 0.0 |
| May | 71°F (22°C) | 39°F (4°C) | 55°F (13°C) | N/A | 8.3 | 0.6 |
| June | 80°F (27°C) | 44°F (7°C) | 62°F (17°C) | N/A | 2.0 | 4.6 |
| July | 91°F (33°C) | 49°F (10°C) | 70°F (21°C) | N/A | 0.0 | 18.1 |
| August | 89°F (31°C) | 48°F (9°C) | 68°F (20°C) | N/A | 0.6 | 15.9 |
| September | 78°F (25°C) | 39°F (4°C) | 59°F (15°C) | N/A | 7.2 | 1.8 |
| October | 63°F (17°C) | 31°F (0°C) | 47°F (8°C) | N/A | 19.1 | 0.0 |
| November | 48°F (9°C) | 25°F (-4°C) | 36°F (2°C) | N/A | 24.1 | 0.0 |
| December | 38°F (3°C) | 21°F (-6°C) | 30°F (-1°C) | N/A | 28.4 | 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
September 14
50% probability date
Last Spring Freeze
May 29
50% probability date
Growing Season
108 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,441
Higher = more heating needed
Cooling Degree Days
375
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
What Rockville's climate means for you
Rockville runs 48°F a year - peaking in July, coldest in December.
- Gardeners get about 108 frost-free days, with the last spring freeze near May 29 - plan the planting calendar around it, not the regional average.
- Energy bills track 6,441 heating and 375 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: Rockville, OR
Based on station USC00357277 feeding NOAA's 1991–2020 climate normals, Rockville, Oregon averages 48°F a year, ranging from a mean daily high of 63°F to a mean daily low of 34°F. July is typically the warmest month of the year, while December 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.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Rockville receives roughly an uncharted amount of precipitation each year, predominantly as rainfall. The frost-free season averages 108 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 29 and the first fall freeze near September 14. For energy use, 6,441 heating degree days and 375 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Rockville scores 49/100 (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 December-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 Rockville, OR? ▼
The average annual temperature in Rockville, Oregon is 48°F. The warmest month averages 91°F (33°C) and the coldest averages 21°F (-6°C).
How much rain does Rockville get? ▼
Rockville receives an unknown amount of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Rockville? ▼
Rockville 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 Rockville? ▼
Rockville has approximately 108 frost-free days per year, with the last spring freeze around May 29 and the first fall freeze around September 14.
How much energy does heating and cooling require in Rockville? ▼
Rockville has 6,441 heating degree days and 375 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 Rockville climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00357277 near Rockville.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00357277. 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.