30-year climate normals

Phillips County Climate and Weather Averages

Hottest month — July

86.3°

average daily high. The coldest month is January, averaging a low of 6.6°F.

Phillips County gets 13.35" of precipitation a year, and 45% of it falls in May, Jun, Jul.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	28.6°	6.6°	0.36"
February	32.4°	10.6°	0.37"
March	45.0°	21.0°	0.51"
April	59.0°	32.8°	1.27"
May	68.8°	42.4°	1.72"
June	76.9°	51.8°	2.68"
July	86.3°	57.4°	1.58"
August	85.6°	55.7°	1.27"
September	74.4°	45.5°	1.41"
October	59.4°	33.2°	1.03"
November	43.3°	20.4°	0.69"
December	31.3°	10.2°	0.46"

Rainfall by month

Phillips County has a distinct wet season. 45% of the year's precipitation arrives in May, Jun, Jul.

January 0.36"

February 0.37"

March 0.51"

April 1.27"

May 1.72"

June 2.68"

July 1.58"

August 1.27"

September 1.41"

October 1.03"

November 0.69"

December 0.46"

Annual total 13.35"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 553

Heating degree days How much heating the climate demands 7,826

Approximate annual cooling cost At 14.67¢/kWh, Montana average $81

Approximate annual electric heating cost Lower where heating is gas rather than electric $402

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Phillips County, where electricity is one line of eight.

Common questions

What is the weather like in Phillips County?

Phillips County averages a high of 86.3°F in July and a low of 6.6°F in January. Annual precipitation is 13.35 inches, with essentially no snow.

When is the rainy season in Phillips County?

The wettest stretch is May, Jun, Jul, which accounts for 45% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Phillips County?

The average daily high in July, the hottest month, is 86.3°F. That drives 553 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Phillips County?

Effectively no. Measurable snowfall is rare in Phillips County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MALTA, MT US (USC00245334), 8 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Montana residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.