Anaconda, Montana climate: Normal weather by month, frost dates and records
Anaconda's normal year runs from 15°F December nights to 83°F July afternoons, with 14.9 inches of precipitation and 75 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.6°C, December lows of −10°C, July highs of 28°C, 378 mm of precipitation a year.
- NOAA stationAnaconda
- Station IDUSC00240199
- Location46.13°N 112.93°W
- Elevation5,230 ft (1,594 m)
- From the center10 miles
- Population9,811
On October 8, the normal high in Anaconda is 61°F and the normal low 33°F, and the chance of measurable rain or snow is 30%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Anaconda.
- Jan 37° 16°
- Feb 39° 16°
- Mar 48° 23°
- Apr 55° 28°
- May 64° 36°
- Jun 73° 43°
- Jul 83° 49°
- Aug 82° 47°
- Sep 72° 40°
- Oct 57° 31°
- Nov 43° 21°
- Dec 34° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Anaconda each month?
July is the warmest month, with normal highs of 83°F; December the coldest, with normal lows of 15°F. The most precipitation falls in June (2.21 in), the least in January (0.57 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 16°F | 26.3°F | 0.57 | 11.4 | 9 | <1 | 30 | 9 h |
| February | 39°F | 16°F | 27.8°F | 0.99 | 11.3 | 9 | <1 | 27 | 10 h 20 min |
| March | 48°F | 23°F | 35.2°F | 1.15 | 11.8 | 11 | <1 | 28 | 11 h 50 min |
| April | 55°F | 28°F | 41.5°F | 1.50 | 9.9 | 12 | <1 | 23 | 13 h 30 min |
| May | 64°F | 36°F | 50.2°F | 2.13 | 2.0 | 14 | <1 | 10 | 15 h |
| June | 73°F | 43°F | 57.8°F | 2.21 | 0.6 | 14 | 1 | 2 | 15 h 40 min |
| July | 83°F | 49°F | 65.7°F | 1.30 | 0.0 | 9 | 6 | <1 | 15 h 30 min |
| August | 82°F | 47°F | 64.4°F | 1.20 | 0.2 | 9 | 4 | <1 | 14 h 10 min |
| September | 72°F | 40°F | 55.9°F | 1.15 | 0.4 | 8 | 1 | 5 | 12 h 40 min |
| October | 57°F | 31°F | 43.8°F | 1.00 | 3.3 | 10 | <1 | 19 | 11 h |
| November | 43°F | 21°F | 32.4°F | 0.97 | 12.1 | 11 | <1 | 27 | 9 h 30 min |
| December | 34°F | 15°F | 24.6°F | 0.72 | 12.1 | 10 | <1 | 30 | 8 h 40 min |
| Year (annual) | 57°F | 30°F | 43.8°F | 14.89 | 75.1 | 125 | 10 | 201 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −9°C | −3.2°C | 14 mm | 29 cm |
| February | 4°C | −9°C | −2.3°C | 25 mm | 29 cm |
| March | 9°C | −5°C | 1.8°C | 29 mm | 30 cm |
| April | 13°C | −2°C | 5.3°C | 38 mm | 25 cm |
| May | 18°C | 2°C | 10.1°C | 54 mm | 5 cm |
| June | 23°C | 6°C | 14.3°C | 56 mm | 2 cm |
| July | 28°C | 9°C | 18.7°C | 33 mm | 0 cm |
| August | 28°C | 8°C | 18.0°C | 30 mm | 1 cm |
| September | 22°C | 4°C | 13.3°C | 29 mm | 1 cm |
| October | 14°C | −1°C | 6.6°C | 25 mm | 8 cm |
| November | 6°C | −6°C | 0.2°C | 25 mm | 31 cm |
| December | 1°C | −10°C | −4.1°C | 18 mm | 31 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00240199; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Anaconda?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, September has the fewest days with rain (8).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00240199.
When is the last frost in Anaconda?
In Anaconda, the last spring frost (32°F) comes after June 1 in half of years and after June 25 in one year in ten; the first autumn frost comes before September 14 in half of years and before August 31 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- June 11 year in 10 after June 25; 9 in 10 after May 14
- First autumn frost, half of years before
- September 141 year in 10 before August 31; 9 in 10 before October 1
NOAA puts the median frost-free season at 105 days, and the season without a hard freeze (28°F) at 138 days.
A hard freeze (28°F) comes after May 13 in half of springs and before September 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Anaconda in zones 4b to 5a across its 4 ZIP code areas (5a in 59711, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Anaconda's NOAA station is in zone 5a: the coldest night of a typical year reaches −19°F (22 complete years).
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00240199; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Anaconda ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Anaconda's 4 ZIP code areas run from zone 4b to 5a: 2 in 4b and 2 in 5a. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Anaconda?
In a normal year in Anaconda, 10 days a year reach 90°F, 201 nights fall to 32°F or colder and 125 days bring measurable precipitation.
- Days at 90°F or more
- 10a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 201a normal year
- Days that stay below freezing
- 35high of 32°F or less
- Days with 0.01 inch of precipitation
- 125a normal year
- Days with 1 inch of snow or more
- 27a normal year
The highest temperature in this station's record (since 1901) is 102°F, on August 27, 1924; the lowest is −38°F, on December 24, 1983.
The wettest calendar year on that record is 1908, with 23.41 in; the snowiest season is 2008–09, with 115.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00240199; records: ACIS (NOAA Regional Climate Centers), station USC00240199. Records use complete months only; a month missing more than three days is left out.
How sunny is Anaconda?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Anaconda, 4.0 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (61%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 1.5 |
| February | 70% | 2.5 |
| March | 69% | 3.7 |
| April | 68% | 4.8 |
| May | 69% | 5.7 |
| June | 74% | 6.5 |
| July | 86% | 7.3 |
| August | 84% | 6.0 |
| September | 79% | 4.5 |
| October | 70% | 2.8 |
| November | 64% | 1.6 |
| December | 61% | 1.2 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Anaconda need?
A normal year in Anaconda brings 7,879 heating degree days, 47% more than the median U.S. place (5,373), and 177 cooling degree days, 81% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,559 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,201 | 0 |
| February | 1,040 | 0 |
| March | 924 | 0 |
| April | 704 | 0 |
| May | 459 | 2 |
| June | 232 | 15 |
| July | 65 | 86 |
| August | 82 | 63 |
| September | 282 | 11 |
| October | 657 | 0 |
| November | 980 | 0 |
| December | 1,254 | 0 |
| Year (annual) | 7,879 | 177 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00240199. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Anaconda been warmer than normal lately?
2024 averaged 43.5°F, 0.3°F below the 1991-2020 normal of 43.8°F. 0 of the 2 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 41.8°F | −2.0°F | 13.70 | 62.1 |
| 2024 | 43.5°F | −0.3°F | – | – |
Over 89 complete years from 1907 to 2024, the station's annual mean temperature rose at a fitted 1.4°F per century (+0.08°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00240199; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Anaconda's climate compare?
Anaconda is warmer than 68 of the other 140 places with their own NOAA record in Montana, and wetter than 65. Across the 7,247 U.S. stations with normals, its annual mean of 43.8°F is warmer than 15%.
In the Köppen classification computed from these normals, Anaconda is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about Anaconda's climate
What is the coldest month in Anaconda?
December, with a normal high of 34°F and a normal low of 15°F. The warmest is July (83°F by day, 49°F at night).
Does it snow in Anaconda?
Yes: 75 inches in a normal year, falling on 48 days with 0.1 inch or more, the most in November (12.1 inches).
What is the rainiest month in Anaconda?
June, with 2.21 in of precipitation in a normal year; the driest is January with 0.57 in.
What plant hardiness zone is Anaconda in?
The USDA's 2023 map puts Anaconda in zones 4b to 5a across its 4 ZIP code areas (5a in 59711, the largest). By the same method at Anaconda's NOAA station, the coldest night of a typical year reaches −19°F (22 years, 1991-2020): zone 5a.
How late can frost come in Anaconda?
In half of years the last 32°F night comes after June 1; in one year in ten it comes after June 25. Waiting until June 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Deer Lodge, MT19 miles from this station, 40.3°F a year
- Phillipsburg Ranger Station, MT22 miles from this station, 42.0°F a year
- Wise River (3 mi WNW), MT23 miles from this station, 37.7°F a year
- Butte, MT24 miles from this station, 40.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made