Aledo weather by month
What a typical year looks like in Aledo, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Aledo, 1 km from Aledo; records cover 1900–2026.
The year at a glance
- Precipitation a year
- 39.1 in993 mm
- Snow a year
- 22 in55 cm
- Last spring freeze
- Apr 19
- First fall freeze
- Oct 16
- Heating degree days
- 6,309
- Cooling degree days
- 884
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −8°−22° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Aledo in January
Highs average 31°−1° and lows 13°−10°, with 1.7 in42 mm of precipitation and 6 in16 cm of snow in a typical January.
- Record high
- 69°21° (1989)
- Record low
- −33°−36° (2019)
- Heating degree days
- 1328
- Cooling degree days
- 0
Aledo in February
Highs average 36°2° and lows 17°−8°, with 1.9 in47 mm of precipitation and 6 in16 cm of snow in a typical February.
- Record high
- 77°25° (2024)
- Record low
- −30°−34° (1905)
- Heating degree days
- 1084
- Cooling degree days
- 0
Aledo in March
Highs average 49°10° and lows 27°−3°, with 2.5 in64 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 94°34° (1928)
- Record low
- −15°−26° (1962)
- Heating degree days
- 830
- Cooling degree days
- 1
Aledo in April
Highs average 62°17° and lows 38°3°, with 4 in102 mm of precipitation and 0.6 in1.5 cm of snow in a typical April.
- Record high
- 93°34° (1930)
- Record low
- 10°−12° (1982)
- Heating degree days
- 455
- Cooling degree days
- 5
Aledo in May
Highs average 73°23° and lows 50°10°, with 5.1 in129 mm of precipitation in a typical May.
- Record high
- 103°39° (1934)
- Record low
- 26°−3° (2005)
- Heating degree days
- 178
- Cooling degree days
- 60
Aledo in June
Highs average 82°28° and lows 60°15°, with 5.4 in136 mm of precipitation in a typical June.
- Record high
- 104°40° (1936)
- Record low
- 36°2° (1945)
- Heating degree days
- 22
- Cooling degree days
- 194
Aledo in July
Highs average 85°29° and lows 63°17°, with 3.9 in98 mm of precipitation in a typical July.
- Record high
- 113°45° (1936)
- Record low
- 44°7° (1975)
- Heating degree days
- 2
- Cooling degree days
- 283
Aledo in August
Highs average 83°28° and lows 62°16°, with 3.9 in99 mm of precipitation in a typical August.
- Record high
- 106°41° (1936)
- Record low
- 38°3° (1915)
- Heating degree days
- 6
- Cooling degree days
- 232
Aledo in September
Highs average 77°25° and lows 53°12°, with 3.7 in95 mm of precipitation in a typical September.
- Record high
- 102°39° (1922)
- Record low
- 24°−4° (1942)
- Heating degree days
- 96
- Cooling degree days
- 97
Aledo in OctoberThis month
Highs average 64°18° and lows 41°5°, with 2.8 in72 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 93°34° (2023)
- Record low
- 9°−13° (1925)
- Heating degree days
- 393
- Cooling degree days
- 12
Aledo in November
Highs average 49°10° and lows 30°−1°, with 2.3 in59 mm of precipitation and 1.4 in3.6 cm of snow in a typical November.
- Record high
- 81°27° (1902)
- Record low
- −6°−21° (1977)
- Heating degree days
- 768
- Cooling degree days
- 0
Aledo in December
Highs average 36°2° and lows 20°−7°, with 2 in51 mm of precipitation and 4 in10 cm of snow in a typical December.
- Record high
- 73°23° (2021)
- Record low
- −22°−30° (1924)
- Heating degree days
- 1147
- Cooling degree days
- 0