Rockville, MD Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Rockville's primary NOAA station, ROCKVILLE 1 NE.
The climate verdict for Rockville
Rockville, Maryland has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 56°F. It scores 80/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 76% of them.
- 56°F
- yearly average temperature, NOAA normal
- 80/100
- comfort score, above 76% of station-mapped location scores
- 41.3"
- precipitation, annual total
- 219 days
- growing season, frost-free days
Rockville: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00187705 · Rockville, MD 56°F mean · 41.3" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 56°F
- RANK-UPPER #4,391
- PHOTO-FINISH ≈ Gentryville
- PRCP-MID 41.3"
- SWING-MID 44°F
- COMF-TOP 80/100
- LOAD-HEAT 4,455 HDD
- STN-1 USC00187705
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Gentryville, MO (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every MD station list.
- Rockville (this station) 56°F
- Hot English, IN 56°F
- Near Gentryville, MO 56°F
- Near Rio Rancho, NM 56°F
- Near Lexington Blueg…, KY 56°F
Climate Living Index · Rockville
Rockville: 74/100 · grade B
Rockville publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Rockville, not an official NOAA rating. Rankings still use Comfort Score 80/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 84 calendar days | 81/100 · B |
| Precipitation balance | 41.3 in · 6.3 from 35 in | 78/100 · B |
| Frost-free season | 219 days/year | 77/100 · B |
| Annual temperature balance | 56.2°F · 11.3° from 67.5°F | 64/100 · C |
Rockville · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Rockville is a temperate Köppen climate: Cfa
Coldest-month mean 34.5°F and warmest-month mean 78.0°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 78.0°F
- Coldest month
- 34.5°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Rockville sits across the climate record
Three NOAA fields for Rockville's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 64th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 61st percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 51st percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Rockville compares across U.S. station-mapped locations
Rockville's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
80 Top 24% score exceeds 76% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). This entry sits in this band.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
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) | 27°F (-3°C) | 35°F (1°C) | 3.1" | 21.8 | 0.0 |
| February | 45°F (7°C) | 28°F (-2°C) | 37°F (3°C) | 2.6" | 19.7 | 0.0 |
| March | 54°F (12°C) | 36°F (2°C) | 45°F (7°C) | 3.7" | 12.9 | 0.0 |
| April | 66°F (19°C) | 46°F (8°C) | 56°F (13°C) | 3.2" | 1.9 | 0.2 |
| May | 74°F (24°C) | 55°F (13°C) | 65°F (18°C) | 3.5" | 0.1 | 1.7 |
| June | 82°F (28°C) | 64°F (18°C) | 73°F (23°C) | 4.0" | 0.0 | 4.3 |
| July | 87°F (31°C) | 69°F (20°C) | 78°F (26°C) | 4.0" | 0.0 | 9.5 |
| August | 85°F (29°C) | 67°F (19°C) | 76°F (24°C) | 3.0" | 0.0 | 6.3 |
| September | 78°F (25°C) | 60°F (16°C) | 69°F (20°C) | 4.0" | 0.0 | 0.8 |
| October | 66°F (19°C) | 48°F (9°C) | 57°F (14°C) | 3.5" | 0.4 | 0.0 |
| November | 56°F (13°C) | 38°F (3°C) | 47°F (8°C) | 3.3" | 9.0 | 0.0 |
| December | 46°F (8°C) | 31°F (-1°C) | 39°F (4°C) | 3.4" | 19.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 88°F around July 13, short of 90°F on every date, while 84 dates carry a normal low at or below freezing, the coldest 26°F near January 25.
The freezing stretch
The normal low stays at or below 32°F into March 2, then returns to freezing around December 10, covering 84 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is May 8, when 37% of years recorded at least a hundredth of an inch. The driest is August 23 at 26%. Summed across the calendar, that is about 114 wet dates a year.
The widest day
April 19 carries the biggest normal gap between afternoon and dawn, 21°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Rockville.
Where Rockville Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 21°F.
Rockville earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
10.2 days with precipitation
7.6 days with precipitation
11.1 days with precipitation
10.4 days with precipitation
11.3 days with precipitation
9.9 days with precipitation
9.9 days with precipitation
7.3 days with precipitation
9.9 days with precipitation
8.0 days with precipitation
8.3 days with precipitation
9.4 days with precipitation
Rockville spreads its precipitation across the year
Neither half of the year dominates here: June through August take 27% of the annual total and December through February 22%, with neither reaching the 35% that would mark a distinct wet season. Rockville has no dry season to plan around, though it does carry a 43.5°F seasonal spread.
The gap between the wettest and driest month still matters: September averages 4.0" and February 2.6". The three wettest months together take 29% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
When it rains in Rockville, it arrives in quantity
41.3" of precipitation falls across only about 113 wet days here, averaging 0.36 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 113 a year, 31% of all days
- Average depth per wet day
- 0.36 inches
- Most wet days
- May, about 11
- Fewest wet days
- August, about 7
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Frost Dates & Growing Season
First Fall Freeze
November 6
50% probability date
Last Spring Freeze
April 1
50% probability date
Growing Season
219 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,455
Higher = more heating needed
Cooling Degree Days
1,279
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MD closest to Rockville on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (56°F here).
- Cape May, NJ 56°F · 0.0°F off
- Carrizozo, NM 56°F · 0.0°F off
- Galena, MO 56°F · 0.0°F off
- Grayville, IL 56°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (41.3" here), excluding temperature-peer places.
- Cambridge, OH 41.3" · 0.0" off
- Dayton, OH 41.3" · 0.0" off
- Wooster, OH 41.3" · 0.0" off
- Holdenville, OK 41.3" · 0.0" off
Data-derived climate profile
How Rockville's climate pattern fits together
heating led · moderate · mid swing
Rockville's energy balance leans toward cold weather: 4,455 annual heating degree days against 1,279 for cooling. Its 43.5°F seasonal range still makes the monthly rows more useful than the annual average alone.
Rockville's frost-free season lasts about 219 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Rockville's middle-range seasonal profile. The measured spread is 43.5°F. The annual average is 56°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Rockville's 41.3 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Rockville's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Rockville, not an official NOAA class or a year-ahead forecast.
Questions about Rockville's climate
How much rain does Rockville get? ▼
How much energy does heating and cooling require in Rockville? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Rockville's primary station: ROCKVILLE 1 NE (USC00187705). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 2467675). Match rule for Rockville: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Rockville comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.