Iowa Weather / Climate

Iowa State Weather / Climate

The location of the state of Iowa plays a huge role in the characterization of the climatic conditions. The state of Iowa is located in the interior areas of the continent and experiences seasonal variations.

Temperature Variations in Iowa

  • Through various surveys it has been recorded that the annual average temperature ranges from 45 degrees F in the extreme northern parts of the state to 52 degrees F in the southeastern region of Iowa.

  • In the month of July, which is incidentally regarded as the hottest month of the year, the average morning temperature is a cool 61 degrees F whereas the average temperature in the afternoon is 82 degrees F in the northeastern areas of Iowa.

  • The southern region on the other hand, records a temperature of 65 degrees F in the morning and 87 degrees F in the afternoon. In the colder months like January for instance, the temperatures recorded in the morning and afternoon are 4 degrees F and 22 degrees F in the north respectively.

  •  In the south, the condition is a bit different with temperatures in the morning and afternoon being 15 degrees F and 32 degrees F respectively.

  • On a broader scale, Iowa’s climate study has shown certain extreme conditions with the highest temperature exceeding 100 degrees F and the minimal temperature in the vicinity of -20 degrees F.

Precipitation in Iowa

  • Precipitation study gives an average statistical data of the annual rainfall and snowfall in the state.

  • 34 inches is the average yearly precipitation recorded in the state of Iowa. In the northern region it is 26 inches but in the southern region of the state precipitation is around 38 inches.

  •  These statistics however, vary every year and depend on a lot of factors. A huge percentage of the total annual precipitation (nearly three fourth) is received between the months of April and September.

  • The highest amount of rainfall received in a span of 24 hours was 13.18 inches. It was recorded near the Atlantic in June, 1998.

  • Snowfall is also a part of precipitation pattern. The state of Iowa receives around 32 inches of snowfall on an average per year.

  •  In the north, the figures are bigger and go up to 40 inches but in the southern part, the figures are a little lower and in the range of 20 inches.

  • The actual winter season through which snowfall is recorded, begins in the month of October and ends in April. However, sometimes due to other factors one can re-gauge the duration, give or take a month.

  •  On a daily basis, the southern region experiences nearly 5 to 6 inches of snowfall. In the northern region however, daily snowfall is around 7 to 8 inches. Heaviest snowfall is observed in the months of December, January and February.

  • During rough weather conditions, as in the case of a storm, the numbers go up and snowfall to the tune of 24 inches has been known to occur in the span of 24 hours.

  • The state of Iowa also experiences over 50 thunderstorms in a year on an average. A lot of these thunderstorms take place between the months of April and September with June being the month in which a lot of storm activity is observed.

  • Tornadoes and hail are some of the by-products of such storms. In a single year the average number of tornadoes is 46, with the months of May and June being the most susceptible of the lot.

  • A lot of agricultural produce is also damaged due to hail and storms especially in June. Iowa’s climate also provides all the factors needed for occurrence of flash floods.

  •  The highest numbers of floods are recorded in the month of June as it receives the highest rainfall of the year (i.e. 4.64 inches).

  • March and April are also conducive months for floods as the melting winter snow along with rain and low temperature, make for a susceptible environment.

Many frozen rivers also start melting in the spring season leading to incidences of flash floods. Floods in the middle of winter season are very rare as most of the precipitation is in the form of snow. 

Iowa Average Temperature

City Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Davenport 30/13 36/19 48/29 61/41 72/52 81/63 85/68 83/66 76/57 65/45 48/32 35/20
Des Moines 29/12 35/18 48/29 61/40 72/51 82/61 86/66 84/64 76/54 64/42 47/29 33/17
Dubuque 25/9 31/15 43/26 57/38 69/49 79/58 82/62 80/60 72/52 60/40 44/28 30/15
Sioux City 29/8 35/15 47/26 62/37 73/49 82/58 86/63 84/61 76/50 64/38 45/25 32/13
Waterloo 26/6 32/13 45/25 60/36 72/48 82/58 85/62 83/60 75/50 62/38 45/25 31/12