Naperville weather by month

Frost and snow-likely months in Naperville

Nights in Naperville average 36°F (2°C) or below in 4 months (January, February, March and December). January, February, March and December combine average lows at or below 32°F (0°C) with 0.4 in (10 mm) or more of monthly precipitation, so precipitation then is likely to fall as snow. The coldest month is January with an average low of 17°F (-8°C) and a record low of -12°F (-25°C).

• January: average low 17°F (-8°C), record low -12°F (-25°C), 1.5 in (37 mm) of precipitation — snow-likely
• February: average low 19°F (-7°C), record low -9°F (-23°C), 1.1 in (27 mm) of precipitation — snow-likely
• March: average low 31°F (-1°C), record low -1°F (-18°C), 2.4 in (60 mm) of precipitation — snow-likely
• December: average low 26°F (-3°C), record low -2°F (-19°C), 1.8 in (45 mm) of precipitation — snow-likely

These records carry temperature and precipitation, not snowfall totals.

Best time to visit Naperville

The most comfortable time to visit Naperville is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 32.9 in (835 mm) a year.

Travellers who prefer heat should aim for July, when highs average 84°F (29°C). June is the month to avoid if rain would spoil your plans — it averages 4.5 in (115 mm), roughly 4× the rainfall of the driest month (February).