Dekalb Weather History Illinois, United States of America

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Daily and hourly data from 1 Jan 2009 onwards.
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Sun 19 Apr, 2026 Weather in Dekalb

Sunrise: 06:08 AM Sunset: 07:41 PM	Moonrise: 07:04 AM Moonset: 11:06 PM	Max: 9.1 °c	Min: 0.3 °c	Avg: 4.8 °c	Precip: 0.00 mm	Max Wind: 26.3 kph

	Sun 19 0:00 am	Sun 19 3:00 am	Sun 19 6:00 am	Sun 19 9:00 am	Sun 19 12:00 pm	Sun 19 3:00 pm	Sun 19 6:00 pm	Sun 19 9:00 pm
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Temp	2.3°c	0.3°c	0.8°c	4.6°c	7.5°c	8.6°c	9.1°c	5.2°c
Wind	9.7 kmph	9.4 kmph	11.2 kmph	26.3 kmph	23.0 kmph	22.7 kmph	19.1 kmph	10.8 kmph
Precip	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm
Cloud	0%	8%	3%	72%	91%	82%	20%	9%
Humidity	73%	82%	78%	53%	47%	41%	42%	52%
Pressure	1020 mb	1021 mb	1022 mb	1023 mb	1023 mb	1023 mb	1024 mb	1025 mb

Dekalb Annual Weather Averages

Month	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
January	-2°C / 28°F	-9°C / 15°F	-6°C / 21°F	108 hours	55.43 mm / 2.18 In	7 days	1020 mb / 31 In
February	0°C / 32°F	-8°C / 18°F	-4°C / 25°F	115 hours	57.89 mm / 2.28 In	6 days	1019 mb / 31 In
March	8°C / 46°F	-1°C / 31°F	3°C / 38°F	138 hours	100.00 mm / 3.94 In	7 days	1018 mb / 31 In
April	14°C / 57°F	4°C / 40°F	9°C / 48°F	134 hours	138.82 mm / 5.47 In	9 days	1014 mb / 30 In
May	20°C / 69°F	11°C / 51°F	15°C / 60°F	165 hours	165.19 mm / 6.50 In	11 days	1015 mb / 30 In
June	26°C / 78°F	16°C / 60°F	21°C / 69°F	197 hours	182.84 mm / 7.20 In	10 days	1013 mb / 30 In
July	27°C / 80°F	18°C / 64°F	22°C / 72°F	206 hours	119.96 mm / 4.72 In	8 days	1015 mb / 30 In
August	26°C / 79°F	17°C / 62°F	21°C / 71°F	217 hours	104.10 mm / 4.10 In	8 days	1015 mb / 30 In
September	24°C / 75°F	13°C / 56°F	18°C / 65°F	222 hours	85.16 mm / 3.35 In	6 days	1017 mb / 31 In
October	16°C / 61°F	7°C / 45°F	11°C / 53°F	171 hours	105.42 mm / 4.15 In	7 days	1016 mb / 30 In
November	8°C / 47°F	0°C / 33°F	4°C / 39°F	170 hours	74.84 mm / 2.95 In	5 days	1019 mb / 31 In
December	2°C / 35°F	-5°C / 24°F	-2°C / 29°F	119 hours	68.24 mm / 2.69 In	7 days	1019 mb / 31 In

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