Climate Overview
The climate in Johnson County Airport is cool. The average annual temperature is 4°C and approximately 1066mm of precipitation falls per year. Johnson County Airport receives a notable amount of rainfall throughout the year, including during its driest month. Johnson County Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are February, December, January, when temperatures can drop to -10°C. Johnson County Airport experiences heavy snowfall, typically from January through December.
Temperature
Temperatures in Johnson County Airport vary considerably across the year, with a 35°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 25°C with a mean of 18°C. The coldest month is February, when overnight lows fall to -10°C and the daily average is -6°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 9°C shift in average temperatures.
Precipitation
Johnson County Airport is a moderately rainy area, receiving approximately 1066mm of precipitation annually, which averages out to around 89mm per month. The wettest month is June, averaging 143mm of rainfall. May and July also tend to see above-average precipitation. The driest month is December, with just 36mm. That's 107mm less than June, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Johnson County Airport receives heavy snowfall, accumulating around 399cm annually from January through December. The snowiest month is April, with approximately 70cm. Winter travel should account for significant snow cover.
Wind
Johnson County Airport is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.
Seasons
94 days until Autumn
It is currently summer in Johnson County Airport, which began on June 21, 2026. Johnson County Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 25°C, while the coldest stretch bottoms out in February near -10°C. Autumn is next, beginning on September 23, 2026 — 94 days from now.
Spring
Temperatures range from -5 to 14°C. Rainfall is heavy, totalling around 339mm across the season with a monthly average of 113mm. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 8 to 25°C. Rainfall is heavy, totalling around 382mm across the season with a monthly average of 127mm. Winds are generally light, averaging 2km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -6 to 19°C. Precipitation is moderate at around 222mm for the season, averaging 74mm per month. Expect around 109cm of snow accumulation during this period. Winds are generally light, averaging 3km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -10 to 0°C. Rainfall is relatively light, with around 123mm over the season and a monthly average of 41mm. Expect around 118cm of snow accumulation during this period. Winds are generally light, averaging 3km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.
Monthly Climate Data
The table below shows monthly climate averages for Johnson County Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
