Castleford, Idaho Weather by Month

Castleford is a small town located in the southern part of Idaho, within Twin Falls County, United States. It is situated approximately 25 miles west of the city of Twin Falls, providing a serene and rural environment that is still within reach of more urban amenities. Castleford lies in the Magic Valley region, which is known for its fertile agricultural lands and stunning landscapes, including the nearby Snake River Canyon.

The town of Castleford covers an area of about 0.6 square miles and has a population of approximately 250 residents, embodying the essence of small-town America. Castleford’s economy is primarily based on agriculture, with many farms and ranches surrounding the town. There are no major universities or famous companies in Castleford, but it is known for its strong sense of community and rural charm.

One of the town’s landmarks includes the Castleford Museum, which offers insights into the local history and heritage of the area. Additionally, the scenic countryside and proximity to natural attractions such as Shoshone Falls and Thousand Springs State Park make Castleford an attractive destination for those who appreciate outdoor activities and nature.

Climate and Weather Overview

Castleford, Idaho, experiences a semi-arid climate, characterized by hot, dry summers and cold winters. The town receives a relatively low amount of precipitation throughout the year and enjoys a high number of sunny days. Below is a table detailing the average temperature, precipitation, and sunny days for each month.

Month Average Temperature (°F) Precipitation (inches) Sunny Days
January 21 – 38 1.0 14
February 25 – 43 0.9 15
March 30 – 52 1.0 17
April 36 – 60 1.1 20
May 44 – 69 1.2 23
June 51 – 78 1.0 27
July 56 – 89 0.4 30
August 54 – 87 0.5 29
September 46 – 77 0.7 26
October 37 – 63 0.8 23
November 28 – 49 1.1 17
December 21 – 38 1.2 14


January in Castleford is typically the coldest month of the year. Average temperatures range from 21°F at night to 38°F during the day. Precipitation is moderate, with an average of 1.0 inches, primarily in the form of snow. The month usually has about 14 sunny days, providing a crisp and clear winter atmosphere.

Recommended Activities

  • Inside Activities: Visiting the Castleford Museum and local libraries.
  • Outside Activities: Ice skating and winter walks in nearby parks.


February sees slightly warmer temperatures, ranging from 25°F to 43°F. Precipitation is similar to January, averaging 0.9 inches. The number of sunny days increases to about 15.

Recommended Activities

  • Inside Activities: Indoor sports at local gyms.
  • Outside Activities: Exploring city parks and trails.


March marks the beginning of spring, with temperatures ranging from 30°F to 52°F. Precipitation remains at 1.0 inches, and there are around 17 sunny days. This month is known for its variable weather, with both snow and mild days.

Recommended Activities

  • Inside Activities: Visiting local libraries and art exhibits.
  • Outside Activities: Early spring hiking and bird watching.


April continues the warming trend with temperatures between 36°F and 60°F. Rainfall increases slightly to 1.1 inches, and there are about 20 sunny days. The weather is typically pleasant, making it a great time for outdoor activities.

Recommended Activities

  • Inside Activities: Enjoying performances at community theaters.
  • Outside Activities: Gardening or visiting botanical gardens.


May is one of the warmer spring months, with average precipitation of 1.2 inches. Temperatures range from 44°F to 69°F, and there are approximately 23 sunny days. The weather is generally warm, making it ideal for outdoor exploration.

Recommended Activities

  • Inside Activities: Attending local art exhibitions.
  • Outside Activities: Hiking, biking, and attending outdoor festivals.


June brings the start of summer, with temperatures climbing from 51°F to 78°F. Rainfall decreases to 1.0 inches, and there are about 27 sunny days. The weather is typically hot and dry.

Recommended Activities

  • Inside Activities: Cooling off in indoor swimming pools.
  • Outside Activities: Visiting water parks and nearby lakes.


July is the hottest month, with temperatures ranging from 56°F to 89°F. Rainfall is very low at 0.4 inches, and the month has about 30 sunny days. The heat can be intense, so outdoor activities are best done in the morning or evening.

Recommended Activities

  • Inside Activities: Watching movies in air-conditioned theaters.
  • Outside Activities: Early morning or late evening walks and picnics.


August remains hot, with temperatures from 54°F to 87°F. Rainfall averages 0.5 inches, and there are about 29 sunny days. The summer heat persists, requiring precautions for outdoor activities.

Recommended Activities

  • Inside Activities: Shopping in air-conditioned malls.
  • Outside Activities: Visiting local swimming spots or rivers.


September sees a slight drop in temperatures, ranging from 46°F to 77°F. Rainfall increases slightly to 0.7 inches, and there are around 26 sunny days. The weather begins to cool slightly, making outdoor activities more comfortable.

Recommended Activities

  • Inside Activities: Attending local craft fairs.
  • Outside Activities: Enjoying fall foliage and outdoor sports.


October is characterized by cooler temperatures between 37°F and 63°F. Rainfall averages 0.8 inches, and there are about 23 sunny days. The cooler temperatures and colorful fall scenery make it a perfect month for outdoor activities.

Recommended Activities

  • Inside Activities: Participating in indoor fall festivals.
  • Outside Activities: Pumpkin picking and attending outdoor markets.


November brings cooler weather, with temperatures from 28°F to 49°F. Rainfall averages 1.1 inches, and there are approximately 17 sunny days. The cooler temperatures and lower humidity make it a pleasant time for outdoor activities.

Recommended Activities

  • Inside Activities: Visiting historical sites and museums.
  • Outside Activities: Hiking and enjoying autumn scenery.


December sees temperatures ranging from 21°F to 38°F. Rainfall is slightly higher at 1.2 inches, and there are about 14 sunny days. The weather is generally cold, with occasional snow.

Recommended Activities

  • Inside Activities: Celebrating holidays with indoor events.
  • Outside Activities: Attending holiday markets and light displays.

Natural Disasters

Castleford, Idaho, experiences a variety of weather conditions throughout the year, including the potential for natural disasters. These include:

  • Flooding: Heavy rains, particularly during spring and early summer, can lead to localized flooding.
  • Snowstorms: Winter months, particularly January and February, can experience significant snowfall, leading to road closures and power outages.
  • Heatwaves: July and August can experience extreme heat, requiring precautions for heat-related illnesses.

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