Alton May Weather Averages Illinois, United States of America

May Weather Averages for Alton

High Temp	23°C	74°F
Low Temp	14°C	57°F
Avg Temp	19°C	65°F
Sunshine Hours	192 hours
Rainfall	147.41 mm	5.80 In
Rain days	10 days
Pressure	1014 mb	30 In

Alton May Averages Year by Year

Year	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
2008	21°C / 70°F	12°C / 53°F	16°C / 61°F	198 hours	145.60 mm / 5.73 In	13 days	1011 mb / 30 In
2009	23°C / 73°F	13°C / 56°F	18°C / 64°F	235 hours	127.60 mm / 5.02 In	9 days	1015 mb / 30 In
2010	23°C / 73°F	14°C / 57°F	18°C / 65°F	208 hours	171.41 mm / 6.75 In	13 days	1014 mb / 30 In
2011	22°C / 72°F	13°C / 55°F	17°C / 63°F	191 hours	200.30 mm / 7.89 In	12 days	1012 mb / 30 In
2012	26°C / 79°F	16°C / 60°F	21°C / 70°F	313 hours	64.84 mm / 2.55 In	6 days	1014 mb / 30 In
2013	22°C / 72°F	13°C / 56°F	18°C / 64°F	168 hours	223.70 mm / 8.81 In	13 days	1014 mb / 30 In
2014	24°C / 75°F	14°C / 57°F	18°C / 65°F	173 hours	97.83 mm / 3.85 In	11 days	1015 mb / 30 In
2015	24°C / 75°F	14°C / 58°F	19°C / 66°F	178 hours	145.42 mm / 5.73 In	15 days	1018 mb / 31 In
2016	22°C / 72°F	13°C / 56°F	17°C / 63°F	190 hours	96.37 mm / 3.79 In	9 days	1015 mb / 30 In
2017	22°C / 72°F	13°C / 55°F	17°C / 63°F	250 hours	204.92 mm / 8.07 In	7 days	1012 mb / 30 In
2018	28°C / 82°F	18°C / 65°F	23°C / 73°F	239 hours	103.32 mm / 4.07 In	8 days	1014 mb / 30 In
2019	23°C / 74°F	14°C / 58°F	19°C / 66°F	177 hours	196.32 mm / 7.73 In	9 days	1013 mb / 30 In
2020	20°C / 68°F	12°C / 54°F	16°C / 62°F	102 hours	138.89 mm / 5.47 In	12 days	1016 mb / 30 In
2021	21°C / 69°F	12°C / 54°F	16°C / 62°F	118 hours	144.15 mm / 5.67 In	9 days	1019 mb / 31 In
2022	24°C / 76°F	15°C / 58°F	19°C / 67°F	135 hours	175.18 mm / 6.90 In	10 days	1013 mb / 30 In
2023	24°C / 76°F	13°C / 56°F	19°C / 66°F	226 hours	112.15 mm / 4.42 In	9 days	1016 mb / 30 In
2024	24°C / 74°F	15°C / 59°F	19°C / 66°F	163 hours	156.16 mm / 6.15 In	8 days	1011 mb / 30 In

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