Conowingo Dam, MD Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Conowingo Dam's primary NOAA station, CONOWINGO DAM.
The climate verdict for Conowingo Dam
Water is the standout signal in Conowingo Dam, Maryland: 48.3 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 55°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.
- 55°F
- annual average temperature (NOAA normal)
- 80/100
- comfort score, above 76% of station-mapped location scores
- 48.3"
- precipitation, annual total
- 217 days
- frost-free days per growing season
Conowingo Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00182060 · Conowingo Dam, MD 55°F mean · 48.3" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 55°F
- RANK-UPPER #4,254
- PHOTO-FINISH ≈ Mansfield
- PRCP-MID 48.3"
- SWING-WIDE 46°F
- COMF-TOP 80/100
- LOAD-HEAT 4,736 HDD
- STN-1 USC00182060
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Mansfield, 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.
- Hot Manassas, VA 56°F
- Conowingo Dam (this station) 55°F
- Near Mansfield, MO 55°F
- Near Teterboro, NJ 55°F
- Near Mcleansboro, IL 55°F
Climate Living Index · Conowingo Dam
Conowingo Dam: 67/100 · grade C
Conowingo Dam publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Conowingo Dam, 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 | 94 calendar days | 78/100 · B |
| Frost-free season | 217 days/year | 76/100 · B |
| Annual temperature balance | 55.4°F · 12.1° from 67.5°F | 61/100 · C |
| Precipitation balance | 48.3 in · 13.3 from 35 in | 53/100 · D |
Conowingo Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Conowingo Dam is a temperate Köppen climate: Cfa
Coldest-month mean 32.5°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
- 32.5°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 Conowingo Dam sits across the climate record
Three NOAA fields for Conowingo Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 62nd percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 23% wettest
- Conowingo Dam's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- 62nd percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Conowingo Dam compares across U.S. station-mapped locations
Conowingo Dam'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
Conowingo Dam's measured station temperature trend
MethodologyAcross 40 complete annual observations from 1936 to 2025, CONOWINGO DAM warmed at a fitted rate of 0.22°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Conowingo Dam primary station fitted change +0.22 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 40°F (5°C) | 25°F (-4°C) | 33°F (0°C) | 3.6" | 26.3 | 0.0 |
| February | 43°F (6°C) | 26°F (-3°C) | 35°F (1°C) | 2.6" | 22.6 | 0.0 |
| March | 51°F (11°C) | 34°F (1°C) | 42°F (6°C) | 4.2" | 17.0 | 0.0 |
| April | 64°F (18°C) | 44°F (7°C) | 54°F (12°C) | 3.4" | 3.4 | 0.3 |
| May | 74°F (23°C) | 54°F (12°C) | 64°F (18°C) | 3.9" | 0.0 | 1.5 |
| June | 83°F (28°C) | 64°F (18°C) | 73°F (23°C) | 4.5" | 0.0 | 7.5 |
| July | 88°F (31°C) | 69°F (20°C) | 78°F (26°C) | 4.7" | 0.0 | 13.9 |
| August | 85°F (30°C) | 67°F (19°C) | 76°F (25°C) | 4.5" | 0.0 | 10.6 |
| September | 79°F (26°C) | 60°F (16°C) | 69°F (21°C) | 5.0" | 0.0 | 2.5 |
| October | 67°F (19°C) | 48°F (9°C) | 57°F (14°C) | 4.5" | 1.3 | 0.2 |
| November | 55°F (13°C) | 37°F (3°C) | 46°F (8°C) | 3.2" | 12.9 | 0.0 |
| December | 45°F (7°C) | 31°F (-1°C) | 38°F (3°C) | 4.0" | 22.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 88°F around July 11, short of 90°F on every date, while 94 dates carry a normal low at or below freezing, the coldest 24°F near January 24.
The freezing stretch
The normal low stays at or below 32°F into March 11, then returns to freezing around December 9, covering 94 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 January 17, when 35% of years recorded at least a hundredth of an inch. The driest is November 3 at 26%. Summed across the calendar, that is about 115 wet dates a year.
The widest day
April 26 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 Conowingo Dam.
Where Conowingo Dam Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 21°F.
Conowingo Dam 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
11.1 days with precipitation
9.4 days with precipitation
11.0 days with precipitation
10.2 days with precipitation
10.5 days with precipitation
9.6 days with precipitation
9.4 days with precipitation
9.1 days with precipitation
9.0 days with precipitation
8.4 days with precipitation
7.8 days with precipitation
9.6 days with precipitation
Conowingo Dam spreads its precipitation across the year
Neither half of the year dominates here: June through August take 28% of the annual total and December through February 21%, with neither reaching the 35% that would mark a distinct wet season. Conowingo Dam has no dry season to plan around, though it does carry a wide 45.5°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: September averages 5.0" and February 2.6". The three wettest months together take 30% 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 Conowingo Dam, it arrives in quantity
48.3" of precipitation falls across only about 115 wet days here, averaging 0.42 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 115 a year, 32% of all days
- Average depth per wet day
- 0.42 inches
- Most wet days
- January, about 11
- Fewest wet days
- November, about 8
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 3
50% probability date
Growing Season
217 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,736
Higher = more heating needed
Cooling Degree Days
1,278
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MD closest to Conowingo Dam 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 (55°F here).
- Appleton City, MO 55°F · 0.0°F off
- Danville, KY 55°F · 0.0°F off
- Elkton, OR 55°F · 0.0°F off
- Erwin, TN 55°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (48.3" here), excluding temperature-peer places.
- Worcester, MA 48.3" · 0.0" off
- High Point, NC 48.3" · 0.0" off
- Clarksburg, WV 48.2" · 0.0" off
- Pageland, SC 48.2" · 0.0" off
Data-derived climate profile
How Conowingo Dam's climate pattern fits together
heating led · wet · mid swing
Conowingo Dam's energy balance leans toward cold weather: 4,736 annual heating degree days against 1,278 for cooling. Its 45.5°F seasonal range still makes the monthly rows more useful than the annual average alone.
Conowingo Dam's frost-free season lasts about 217 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 Conowingo Dam's middle-range seasonal profile. The measured spread is 45.5°F. The annual average is 55°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Alongside its heating load, Conowingo Dam carries 48.3 inches of precipitation in a normal year, inside PlainClimate's wet range. Snowfall is not added to the interpretation because its annual value is missing. That distinction matters because a wet annual total can arrive as rain, snow, or a mixture at different times.
These labels group NOAA 1991-2020 normals from Conowingo Dam'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 Conowingo Dam, not an official NOAA class or a year-ahead forecast.
Questions about Conowingo Dam's climate
How much rain does Conowingo Dam get? ▼
How many days above 90°F does Conowingo Dam get? ▼
How much energy does heating and cooling require in Conowingo Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Conowingo Dam's primary station: CONOWINGO DAM (USC00182060). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Conowingo Dam; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Conowingo Dam 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.