Bonny Dam, CO 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 Bonny Dam's primary NOAA station, BONNY DAM 2NE.
The climate verdict for Bonny Dam
Dryness leads the climate profile for Bonny Dam, Colorado, with 18.0 inches of precipitation a year. NOAA records an annual average of 52°F. At 49/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 18% of scores.
- 52°F
- annual average temperature (NOAA normal)
- 49/100
- comfort score, above 18% of station-mapped location scores
- 18.0"
- annual precipitation · 24" snow
- 158 days
- frost-free growing season
Bonny Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00050834 · Bonny Dam, CO 52°F mean · 18.0" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 52°F
- RANK-MID #3,293
- PHOTO-FINISH ≈ Goodland
- PRCP-DRY 18.0"
- SWING-WIDE 46°F
- COMF-LOW 49/100
- LOAD-HEAT 5,807 HDD
- STN-1 USC00050834
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Goodland, KS (+ 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 CO station list.
- Bonny Dam (this station) 52°F
- Cold Milford, UT 52°F
- Hot Rushville, IL 52°F
- Near Goodland, KS 52°F
- Near Mason City, IL 52°F
Climate Living Index · Bonny Dam
Bonny Dam: 35/100 · grade F
Bonny Dam publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Bonny Dam, not an official NOAA rating. Rankings still use Comfort Score 49/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 51.7°F · 15.8° from 67.5°F | 48/100 · D |
| Snowfall burden | 24.1 inches/year | 45/100 · D |
| Precipitation balance | 18.0 in · 17.0 from 35 in | 39/100 · F |
| Frost-free season | 158 days/year | 32/100 · F |
| Normal heat + freeze calendar | 192 calendar days | 18/100 · F |
Bonny Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Bonny Dam's normals sit in a dry climate class: BSk
Precipitation is low relative to temperature but above true desert thresholds: cold semi-arid steppe (BSk). Class BSk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold semi-arid steppe.
- Köppen code
- BSk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 76.1°F
- Coldest month
- 30.0°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 Bonny Dam sits across the climate record
Three NOAA fields for Bonny Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 48th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 76%
- Bonny Dam's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 64th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Bonny Dam compares across U.S. station-mapped locations
Bonny Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
49 18th percentile score exceeds 18% 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%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Bonny Dam's measured station temperature trend
MethodologyAcross 37 complete annual observations from 1952 to 2023, BONNY DAM 2NE warmed at a fitted rate of 0.16°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Bonny Dam primary station fitted change +0.16 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 43°F (6°C) | 17°F (-8°C) | 30°F (-1°C) | 0.4" | 4.6" | 30.0 | 0.0 |
| February | 46°F (8°C) | 19°F (-7°C) | 32°F (0°C) | 0.4" | 5.3" | 26.5 | 0.0 |
| March | 56°F (13°C) | 27°F (-3°C) | 41°F (5°C) | 0.9" | 3.1" | 22.8 | 0.0 |
| April | 64°F (18°C) | 35°F (1°C) | 49°F (10°C) | 1.8" | 2.5" | 10.9 | 0.1 |
| May | 73°F (23°C) | 45°F (7°C) | 59°F (15°C) | 2.7" | 0.3" | 1.8 | 2.3 |
| June | 86°F (30°C) | 56°F (13°C) | 71°F (22°C) | 2.6" | 0.0" | 0.0 | 10.1 |
| July | 91°F (33°C) | 62°F (16°C) | 76°F (24°C) | 3.2" | 0.0" | 0.0 | 18.7 |
| August | 88°F (31°C) | 59°F (15°C) | 74°F (23°C) | 1.9" | 0.0" | 0.0 | 16.0 |
| September | 80°F (27°C) | 50°F (10°C) | 65°F (19°C) | 1.8" | 0.3" | 0.5 | 6.1 |
| October | 67°F (19°C) | 37°F (3°C) | 52°F (11°C) | 1.3" | 1.8" | 7.8 | 0.7 |
| November | 54°F (12°C) | 26°F (-4°C) | 40°F (4°C) | 0.6" | 1.9" | 23.4 | 0.0 |
| December | 44°F (6°C) | 18°F (-8°C) | 31°F (-1°C) | 0.5" | 4.3" | 30.1 | 0.0 |
The year, day by day
Bonny Dam works both ends of the calendar. Normal highs climb to 91°F by July 16 and hold at or above 90°F on 33 dates, then normal lows drop to freezing or below on 159 dates, bottoming at 17°F around December 25.
When the heat sits
Normal highs reach 90°F from July 3 through August 4, covering 33 dates. The broader mild season, normal highs of 70°F or more, runs May 9 to October 8.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into April 5, then returns to freezing around October 30, covering 159 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 31, when 25% of years recorded at least a hundredth of an inch. The driest is November 22 at 7%. Summed across the calendar, that is about 54 wet dates a year.
The widest day
April 2 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Bonny Dam.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 4.6"
2.2 days with precipitation
Snow: 5.3"
2.8 days with precipitation
Snow: 3.1"
3.4 days with precipitation
Snow: 2.5"
5.9 days with precipitation
Snow: 0.3"
7.0 days with precipitation
6.6 days with precipitation
7.4 days with precipitation
6.0 days with precipitation
Snow: 0.3"
4.1 days with precipitation
Snow: 1.8"
3.8 days with precipitation
Snow: 1.9"
2.4 days with precipitation
Snow: 4.3"
2.6 days with precipitation
Bonny Dam runs a summer-peaked wet season
43% of Bonny Dam's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is July at 3.2", on a wide 46.1°F gap between its warmest and coldest month. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: July, May, June, taking 48% of the annual total between them.
- Driest month: January at 0.4".
- Winter share: 7% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
How Bonny Dam's precipitation splits across the calendar
About 54 days a year record measurable precipitation here, carrying 18.0" between them, or roughly 0.33 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Bonny Dam
Bonny Dam averages 24.1 inches of snowfall a year, with February the snowiest month on the normals, spread across roughly 11 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 24.1 inches of depth.
- Days recording measurable snow: about 11 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 13% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 10
50% probability date
Last Spring Freeze
May 5
50% probability date
Growing Season
158 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,807
Higher = more heating needed
Cooling Degree Days
996
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside CO closest to Bonny 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 (52°F here).
- Conception, MO 52°F · 0.0°F off
- Connell, WA 52°F · 0.0°F off
- Donnellson, IA 52°F · 0.0°F off
- Dugway, UT 52°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (18.0" here), excluding temperature-peer places.
- Muleshoe, TX 17.9" · 0.0" off
- San Luis Obispo, CA 17.9" · 0.0" off
- Wallowa, OR 18.0" · 0.0" off
- Belle Fourche, SD 18.0" · 0.0" off
Snow and freeze rhythm
When cold and snow define Bonny Dam
heating led · dry · mid swing
Bonny Dam's energy balance leans toward cold weather: 5,807 annual heating degree days against 996 for cooling. Its 46.1°F seasonal range still makes the monthly rows more useful than the annual average alone.
Bonny Dam's frost-free season lasts about 158 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Bonny Dam coldest normal
January
The monthly mean of 30°F (-1°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Bonny Dam typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Bonny Dam snow peak
February
Bonny Dam averages 24.1 inches of snow a year, with February the snowiest month on the normals.
Questions about Bonny Dam's climate
How much snow does Bonny Dam get? ▼
How many days above 90°F does Bonny Dam get? ▼
How much energy does heating and cooling require in Bonny Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Bonny Dam's primary station: BONNY DAM 2NE (USC00050834). 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 Bonny 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 Bonny 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.