Weather forecast July 30th, 2024

Climate and Average Weather Year Round in Johnstown Colorado, United States

In Johnstown, the summers are hot and mostly clear and the winters are very cold, snowy, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 17°F to 89°F and is rarely below 1°F or above 97°F.

Based on the tourism score, the best time of year to visit Johnstown for warm-weather activities is from mid June to late August.

Average Temperature in Johnstown 

The hot season lasts for 3.3 months, from June 5 to September 13, with an average daily high temperature above 79°F. The hottest month of the year in Johnstown is July, with an average high of 88°F and low of 59°F.

The cold season lasts for 3.2 months, from November 20 to February 25, with an average daily high temperature below 50°F. The coldest month of the year in Johnstown is December, with an average low of 19°F and high of 42°F.

Rainfall 

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Johnstown experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.7 months, from March 10 to October 31, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Johnstown is May, with an average rainfall of 1.9 inches.

The rainless period of the year lasts for 4.3 months, from October 31 to March 10. The month with the least rain in Johnstown is December, with an average rainfall of 0.1 inches.

Weather forecast July 30th, 2024

Weather 80034 - Waheat Ridge CO

High temperature : 92°F

Low temperature : 85°F

- Overcast clouds, Wind speed 5.01 mph, wind out of the N. Visibility 7 mi, humidity 17% . Chance of Rain : 100 % .

Today's Air Quality - Weather 80034 : Poor

- Air Quality Index : CO : 200.27 ; NH3 : 0.73 ; NO : 0.27 ; NO2 : 8.57 ; O3 : 134.47 ; PM10 : 7.22 ; PM2.5 : 4.86 ; SO2 : 1.01

Weather 80033 - Wheat Ridge CO

High temperature : 92°F

Low temperature : 85°F

- Overcast clouds, Wind speed 5.01 mph, wind out of the N. Visibility 7 mi, humidity 17% . Chance of Rain : 100 % .

Today's Air Quality - Weather 80033 : Poor

- Air Quality Index : CO : 200.27 ; NH3 : 0.73 ; NO : 0.27 ; NO2 : 8.57 ; O3 : 134.47 ; PM10 : 7.22 ; PM2.5 : 4.86 ; SO2 : 1.01

Weather 80031 - Westminster CO

High temperature : 92°F

Low temperature : 85°F

- Overcast clouds, Wind speed 4 mph, wind out of the S. Visibility 7 mi, humidity 17% . Chance of Rain : 20 % .

Today's Air Quality - Weather 80031 : Very unhealthy

- Air Quality Index : CO : 273.71 ; NH3 : 1.98 ; NO : 0.69 ; NO2 : 15.42 ; O3 : 191.69 ; PM10 : 9.68 ; PM2.5 : 7.17 ; SO2 : 1.45

Weather 80030 - Westminster CO

High temperature : 92°F

Low temperature : 85°F

- Overcast clouds, Wind speed 4 mph, wind out of the S. Visibility 7 mi, humidity 17% . Chance of Rain : 20 % .

Today's Air Quality - Weather 80030 : Very unhealthy

- Air Quality Index : CO : 273.71 ; NH3 : 1.98 ; NO : 0.69 ; NO2 : 15.42 ; O3 : 191.69 ; PM10 : 9.68 ; PM2.5 : 7.17 ; SO2 : 1.45

Weather 80028 - Louisville CO

High temperature : 92°F

Low temperature : 86°F

- Overcast clouds, Wind speed 3.44 mph, wind out of the E. Visibility 7 mi, humidity 18% . Chance of Rain : 20 % .

Today's Air Quality - Weather 80028 : Very unhealthy

- Air Quality Index : CO : 273.71 ; NH3 : 1.98 ; NO : 0.69 ; NO2 : 15.42 ; O3 : 191.69 ; PM10 : 9.68 ; PM2.5 : 7.17 ; SO2 : 1.45

Weather 80027 - Louisville CO

High temperature : 92°F

Low temperature : 85°F

- Overcast clouds, Wind speed 3.44 mph, wind out of the E. Visibility 7 mi, humidity 18% . Chance of Rain : 20 % .

Today's Air Quality - Weather 80027 : Very unhealthy

- Air Quality Index : CO : 273.71 ; NH3 : 1.98 ; NO : 0.69 ; NO2 : 15.42 ; O3 : 191.69 ; PM10 : 9.68 ; PM2.5 : 7.17 ; SO2 : 1.45

Weather 80026 - Lafayette CO

High temperature : 92°F

Low temperature : 86°F

- Overcast clouds, Wind speed 4 mph, wind out of the N. Visibility 7 mi, humidity 19% . Chance of Rain : 20 % .

Today's Air Quality - Weather 80026 : Very unhealthy

- Air Quality Index : CO : 273.71 ; NH3 : 1.98 ; NO : 0.69 ; NO2 : 15.42 ; O3 : 191.69 ; PM10 : 9.68 ; PM2.5 : 7.17 ; SO2 : 1.45

Weather 80025 - Eldorado Springs CO

High temperature : 90°F

Low temperature : 84°F

- Overcast clouds, Wind speed 1.01 mph, wind out of the SE. Visibility 7 mi, humidity 19% . Chance of Rain : 100 % .

Today's Air Quality - Weather 80025 : Moderate

- Air Quality Index : CO : 150.2 ; NH3 : 0.28 ; NO : 0.12 ; NO2 : 1.24 ; O3 : 90.84 ; PM10 : 3.74 ; PM2.5 : 2.45 ; SO2 : 0.06

Weather 80024 - Dupont CO

High temperature : 93°F

Low temperature : 86°F

- Overcast clouds, Wind speed 4 mph, wind out of the SSW. Visibility 7 mi, humidity 16% . Chance of Rain : 75 % .

Today's Air Quality - Weather 80024 : Unhealthy

- Air Quality Index : CO : 205.28 ; NH3 : 1.3 ; NO : 0.5 ; NO2 : 9.94 ; O3 : 143.05 ; PM10 : 8.4 ; PM2.5 : 5.65 ; SO2 : 1.07

Weather 80023 - Broomfield CO

High temperature : 92°F

Low temperature : 86°F

- Overcast clouds, Wind speed 4 mph, wind out of the S. Visibility 7 mi, humidity 17% . Chance of Rain : 20 % .

Today's Air Quality - Weather 80023 : Very unhealthy

- Air Quality Index : CO : 273.71 ; NH3 : 1.98 ; NO : 0.69 ; NO2 : 15.42 ; O3 : 191.69 ; PM10 : 9.68 ; PM2.5 : 7.17 ; SO2 : 1.45