Please note, Degree Days and Palmer Indices are not available for Alaska or Hawaii. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales. Data are available for bulk download.
Base Period
Trend

Filter
Illinois Precipitation
February-April
Period
Precipitation
Rank
(out of 117)
Anomaly
1901-2000 Mean: 8.66in
February-April 201113.58"1164.92"
February-April 20107.63"44-1.03"
February-April 200912.64"1103.98"
February-April 200813.27"1154.61"
February-April 20079.03"700.37"
February-April 20069.25"750.59"
February-April 20056.01"12-2.65"
February-April 20046.70"23-1.96"
February-April 20036.99"28-1.67"
February-April 200210.30"911.64"
February-April 20017.25"34-1.41"
February-April 20007.55"43-1.11"
February-April 19999.67"831.01"
February-April 199812.03"1063.37"
February-April 19979.16"740.50"
February-April 19967.92"47-0.74"
February-April 19957.93"49-0.73"
February-April 19949.15"730.49"
February-April 19939.96"861.30"
February-April 19926.93"26-1.73"
February-April 19918.32"57-0.34"
February-April 199010.22"901.56"
February-April 19898.26"55-0.40"
February-April 19887.10"31-1.56"
February-April 19875.40"6-3.26"
February-April 19866.07"13-2.59"
February-April 198510.84"952.18"
February-April 198411.14"972.48"
February-April 198310.50"921.84"
February-April 19828.12"52-0.54"
February-April 19818.43"58-0.23"
February-April 19807.08"29-1.58"
February-April 197912.25"1083.59"
February-April 19787.35"35-1.31"
February-April 19779.00"680.34"
February-April 19769.32"770.66"
February-April 197510.67"932.01"
February-April 19749.60"820.94"
February-April 197313.23"1144.57"
February-April 19729.56"810.90"
February-April 19715.73"9-2.93"
February-April 19709.33"780.67"
February-April 19697.19"32-1.47"
February-April 19686.48"18-2.18"
February-April 19678.27"56-0.39"
February-April 19669.09"710.43"
February-April 19659.31"760.65"
February-April 196411.81"1033.15"
February-April 19638.64"61-0.02"
February-April 19627.09"30-1.57"
February-April 19619.40"790.74"
February-April 19607.93"49-0.73"
February-April 19598.74"630.08"
February-April 19585.14"5-3.52"
February-April 195711.33"1012.67"
February-April 19567.51"41-1.15"
February-April 19558.99"670.33"
February-April 19548.61"60-0.05"
February-April 19538.88"640.22"
February-April 19529.46"800.80"
February-April 195110.86"962.20"
February-April 195011.15"982.49"
February-April 19497.46"38-1.20"
February-April 19489.11"720.45"
February-April 19478.91"660.25"
February-April 19466.77"25-1.89"
February-April 194514.08"1175.42"
February-April 194413.06"1134.40"
February-April 19437.47"40-1.19"
February-April 19428.67"620.01"
February-April 19415.80"10-2.86"
February-April 19407.46"38-1.20"
February-April 193911.51"1022.85"
February-April 193811.19"1002.53"
February-April 19377.51"41-1.15"
February-April 19365.89"11-2.77"
February-April 19358.45"59-0.21"
February-April 19344.92"4-3.74"
February-April 19339.03"700.37"
February-April 19325.41"7-3.25"
February-April 19316.64"21-2.02"
February-April 19306.20"14-2.46"
February-April 19299.80"841.14"
February-April 19286.98"27-1.68"
February-April 192712.88"1124.22"
February-April 19268.12"52-0.54"
February-April 19256.71"24-1.95"
February-April 19246.42"17-2.24"
February-April 19238.13"54-0.53"
February-April 192212.72"1114.06"
February-April 192110.69"942.03"
February-April 192010.12"891.46"
February-April 19197.64"45-1.02"
February-April 19187.84"46-0.82"
February-April 19177.92"47-0.74"
February-April 19164.60"3-4.06"
February-April 19154.42"2-4.24"
February-April 19146.55"19-2.11"
February-April 191310.00"881.34"
February-April 19129.99"871.33"
February-April 19118.89"650.23"
February-April 19105.52"8-3.14"
February-April 190912.47"1093.81"
February-April 190811.95"1043.29"
February-April 19076.33"15-2.33"
February-April 19068.02"51-0.64"
February-April 19057.41"36-1.25"
February-April 190411.17"992.51"
February-April 19039.91"851.25"
February-April 19027.21"33-1.45"
February-April 19016.62"20-2.04"
February-April 19007.42"37-1.24"
February-April 18996.65"22-2.01"
February-April 189812.19"1073.53"
February-April 189712.02"1053.36"
February-April 18966.41"16-2.25"
February-April 18954.18"1-4.48"

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