Aurora climate
Aurora (Illinois, United States) has a hot-summer humid continental climate (Köppen Dfa). The average temperature over the year is 10 °C49 °F, and about 983 mm39 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Aurora climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −130 | −1015 | −522 | 441.7 | 30 |
| Feb | 133 | −917 | −425 | 512.0 | 27 |
| Mar | 745 | −327 | 236 | 632.5 | 23 |
| Apr | 1559 | 337 | 948 | 953.7 | 8 |
| May | 2170 | 948 | 1559 | 1204.7 | 0 |
| Jun | 2780 | 1559 | 2169 | 1124.4 | 0 |
| Jul | 2985 | 1865 | 2475 | 1003.9 | 0 |
| Aug | 2883 | 1763 | 2373 | 1064.2 | 0 |
| Sep | 2476 | 1355 | 1965 | 873.4 | 0 |
| Oct | 1661 | 642 | 1152 | 913.6 | 4 |
| Nov | 947 | −131 | 439 | 582.3 | 18 |
| Dec | 135 | −621 | −228 | 572.2 | 27 |
| Year | 2985 | −1015 | 1049 | 98339 | 137 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 87% | 68% | 1.7 | 9:28 |
| Feb | 85% | 67% | 2.6 | 10:32 |
| Mar | 80% | 64% | 3.6 | 11:49 |
| Apr | 76% | 61% | 4.7 | 13:17 |
| May | 76% | 62% | 5.5 | 14:31 |
| Jun | 74% | 55% | 6.1 | 15:12 |
| Jul | 72% | 48% | 6.2 | 14:55 |
| Aug | 72% | 47% | 5.4 | 13:51 |
| Sep | 74% | 44% | 4.5 | 12:25 |
| Oct | 76% | 57% | 3.0 | 10:00 |
| Nov | 81% | 62% | 2.0 | 9:45 |
| Dec | 87% | 70% | 1.5 | 9:09 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Aurora is like
The warmest month is July, with an average high of 29 °C85 °F and a low of 18 °C65 °F. The coldest is January, when highs average −1 °C30 °F and lows −10 °C15 °F. Seasons are strongly marked: the warmest month is on average 29.1 °C52.3 °F warmer than the coldest.
Annual precipitation is moderate at about 983 mm39 in. The wettest three-month stretch is May–July, which brings 34% of the annual total. The wettest month is May (120 mm4.7 in), the driest is January (44 mm1.7 in).
Relative humidity ranges from 72% in July to 87% in January. The clearest skies (lowest average cloud amount, 44%) are typical of September. Average wind speed near the ground ranges from 8 km/h (5 mph) in August to 15 km/h (9 mph) in January. Daylight lasts from about 9.2 hours in December to 15.2 hours in June.
A lasting snow cover is typical in December–February, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 16 cm).
Best time to visit Aurora
Based on these averages, the most comfortable months for sightseeing and outdoor activities are August and September: average highs of 24 °C76 °F to 28 °C83 °F with 87 mm3.4 in to 106 mm4.2 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of −1 °C30 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Aurora
- Winter (December–February) — highs −130 to 1 °C35 °F, lows −1015 to −6 °C21 °F, about 51 mm2.0 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 745 to 21 °C70 °F, lows −327 to 9 °C48 °F, about 93 mm3.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Summer (June–August) — highs 2780 to 29 °C85 °F, lows 1559 to 18 °C65 °F, about 106 mm4.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Autumn (September–November) — highs 947 to 24 °C76 °F, lows −131 to 13 °C55 °F, about 79 mm3.1 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
How Aurora compares
Compared with Chicago, about 56 km to the east, Aurora has practically the same average temperature and receives a similar amount of precipitation. The difference is largest in May (3.1 °C5.7 °F warmer).
Of the 222 places in the United States covered by World Climates, Aurora is the 201st warmest by annual mean temperature and the 109th wettest by annual precipitation. See all of them on the United States climate page.
Places in other countries with the most similar temperature and rainfall pattern: Windsor (Canada, Dfa), Brantford (Canada, Dfa) and London (Canada, Dfa).
The same NASA POWER grid cell also contains Naperville (pop. 147,100). Their long-term averages in this dataset are essentially the same as for Aurora, so they do not have separate pages.
Nearby places
- Elgin 31 km · 10 °C49 °F · 983 mm39 in
- Joliet 33 km · 10 °C51 °F · 985 mm39 in
- Chicago 56 km · 10 °C50 °F · 982 mm39 in
- Rockford 86 km · 9 °C48 °F · 967 mm38 in
- Milwaukee 146 km · 9 °C48 °F · 945 mm37 in
- Peoria 159 km · 11 °C52 °F · 983 mm39 in
- Madison 171 km · 8 °C47 °F · 970 mm38 in
- South Bend 172 km · 10 °C50 °F · 994 mm39 in
Frequently asked questions
What is the warmest month in Aurora?
July is the warmest month in Aurora, with an average high of 29 °C (85 °F) and an average low of 18 °C (65 °F).
What is the coldest month in Aurora?
January is the coldest month, with an average high of -1 °C (30 °F) and an average low of -10 °C (15 °F).
When does it rain the most in Aurora?
May is the wettest month with about 120 mm (4.7 in) of precipitation; January is the driest with about 44 mm (1.7 in).
What is the best time to visit Aurora?
Judging by long-term averages, the most comfortable months are August and September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.