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
Iowa Precipitation
December
Period
Precipitation
Rank
(out of 130)
December 20241.34"85
December 20231.84"112
December 20221.69"106
December 20210.87"45
December 20201.14"71
December 20191.28"82
December 20182.10"122
December 20170.39"8
December 20161.52"99
December 20154.71"130
December 20141.10"67
December 20130.62"28
December 20121.52"99
December 20112.08"119
December 20101.23"78
December 20092.54"128
December 20081.88"115
December 20072.44"126
December 20062.09"120
December 20051.17"72
December 20040.58"24
December 20031.28"82
December 20020.24"1
December 20010.83"44
December 20001.67"103
December 19990.71"34
December 19980.42"12
December 19971.00"55
December 19960.87"45
December 19950.40"9
December 19941.19"76
December 19930.76"39
December 19921.78"110
December 19911.48"94
December 19901.50"96
December 19890.36"5
December 19880.80"42
December 19871.80"111
December 19860.81"43
December 19851.27"80
December 19842.10"122
December 19831.11"68
December 19823.40"129
December 19811.10"67
December 19801.09"64
December 19790.54"19
December 19781.02"57
December 19771.06"62
December 19760.31"3
December 19750.76"39
December 19741.12"70
December 19732.03"117
December 19721.73"108
December 19711.87"114
December 19701.12"70
December 19691.46"93
December 19682.07"118
December 19670.91"48
December 19661.06"62
December 19651.68"105
December 19640.94"49
December 19630.48"15
December 19620.38"7
December 19611.49"95
December 19600.62"28
December 19591.77"109
December 19580.25"2
December 19571.18"75
December 19560.52"17
December 19550.49"16
December 19540.72"36
December 19531.34"85
December 19521.18"75
December 19510.97"52
December 19500.75"38
December 19491.09"64
December 19481.68"105
December 19471.45"92
December 19460.62"28
December 19451.96"116
December 19441.24"79
December 19430.52"17
December 19421.53"100
December 19411.85"113
December 19401.36"87
December 19390.60"27
December 19380.69"33
December 19370.74"37
December 19361.51"97
December 19350.94"49
December 19340.59"26
December 19331.01"56
December 19321.38"89
December 19312.40"125
December 19300.55"21
December 19290.40"9
December 19280.87"45
December 19271.05"60
December 19261.05"60
December 19251.36"87
December 19241.71"107
December 19230.77"41
December 19220.35"4
December 19211.04"59
December 19201.18"75
December 19190.57"23
December 19181.23"78
December 19170.55"21
December 19161.02"57
December 19150.66"32
December 19141.30"83
December 19130.97"52
December 19120.71"34
December 19112.51"127
December 19100.37"6
December 19092.17"124
December 19080.58"24
December 19070.98"54
December 19061.45"92
December 19050.54"19
December 19041.38"89
December 19030.41"11
December 19022.16"123
December 19010.95"51
December 19000.44"13
December 18991.59"101
December 18980.46"14
December 18971.62"102
December 18960.64"31
December 18951.45"92

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