Editing Crystal Lake, Illinois (section)

===Climate===
The city's climate is much like that of its large neighboring city, Chicago. The city experiences hot summers and cold winters, with temperatures slightly more extreme than those of closer suburbs, because rural land still surrounds the city. Due to the lack of the [[urban heat island]] effect, Crystal Lake experiences colder nights and lower precipitation than recorded at Chicago. High temperatures are usually comparable to those in Chicago, with only a few degrees difference on most days.

The hottest month of the year is July, when the average high temperature is approximately {{convert|86|F|C}}. Temperatures in July, and in summer in general, can frequently exceed {{convert|95|F|C}}, and occasionally exceed {{convert|100|F|C}}, although this does not happen each year. The coldest month of the year is January, where the average high temperature is {{convert|23|F|C}}. Overnight low temperatures are usually around {{convert|8|F|C}}. In winter, the low temperatures fall below {{convert|0|F|C}} on many (often as many as fifteen or twenty) occasions per year. Extremely cold nights may record temperatures as low as {{convert|-20|F|C}} or lower, but this is rare and does not happen each year.<ref name="history" />

The wettest month of the year is August, when thunderstorms contribute brief, heavy downpours of rain. July is the second-wettest month of the year, also mainly due to thunderstorms. However, long dry spells can also occur at this time of year, sometimes lasting weeks. The two driest months of the year are January and February, where almost all of the precipitation falls as snow. In a typical year, total precipitation is {{convert|37|in|mm}} with a winter snowfall total of {{convert|40|in|mm}}. Large snowstorms, although rare, do occur and can accumulate large amounts of snow. In many years, at least one storm will deliver {{convert|12|in|mm}} of snow in one day. Most snow-bearing systems are [[Alberta clipper]]s, while the more infrequent heavy snows are caused by [[Panhandle hook]]s.

{{Weather box
|location = Crystal Lake, Illinois, 1981–2010 normals, extremes 1849–present
|single line = Y
|Jan high F = 28
|Feb high F = 33
|Mar high F = 44
|Apr high F = 58
|May high F = 69
|Jun high F = 79
|Jul high F = 83
|Aug high F = 81
|Sep high F = 74
|Oct high F = 62
|Nov high F = 46
|Dec high F = 33
|year high F = 58
|Jan mean F = 20
|Feb mean F = 25
|Mar mean F = 35
|Apr mean F = 47
|May mean F = 58
|Jun mean F = 68
|Jul mean F = 73
|Aug mean F = 71
|Sep mean F = 63
|Oct mean F = 51
|Nov mean F = 38
|Dec mean F = 25
|year mean F = 48
|Jan low F = 11
|Feb low F = 16
|Mar low F = 26
|Apr low F = 36
|May low F = 47
|Jun low F = 57
|Jul low F = 62
|Aug low F = 60
|Sep low F = 51
|Oct low F = 40
|Nov low F = 29
|Dec low F = 17
|year low F = 38
|Jan record high F =  62
|Feb record high F =  70
|Mar record high F =  82
|Apr record high F =  91
|May record high F =  92
|Jun record high F =  101
|Jul record high F =  101
|Aug record high F =  98
|Sep record high F = 95
|Oct record high F = 89
|Nov record high F =  75
|Dec record high F =  67
|year record high F = 101
|Jan record low F = -27
|Feb record low F = -22
|Mar record low F = -8
|Apr record low F = 11
|May record low F = 28
|Jun record low F = 36
|Jul record low F = 45
|Aug record low F = 40
|Sep record low F = 29
|Oct record low F = 18
|Nov record low F = -7
|Dec record low F = -24
|year record low F= -27
|rain colour =
|Jan rain inch = 1.68
|Feb rain inch = 1.38
|Mar rain inch = 2.23
|Apr rain inch = 3.91
|May rain inch = 3.84
|Jun rain inch = 4.31
|Jul rain inch = 3.93
|Aug rain inch = 4.43
|Sep rain inch = 3.63
|Oct rain inch = 2.66
|Nov rain inch = 3.12
|Dec rain inch = 2.1
|year rain inch=37.22
|Jan snow inch = 10.2
|Feb snow inch = 7.3
|Mar snow inch = 4.5
|Apr snow inch = 1.1
|May snow inch = T
|Jun snow inch = 0.0
|Jul snow inch = 0.0
|Aug snow inch = 0.0
|Sep snow inch = 0.0
|Oct snow inch = 0.1
|Nov snow inch = 1.5
|Dec snow inch = 9.8
|year snow inch=34.5
|source 1 = http://www.intellicast.com/Local/History.aspx?location=USIL0280
|source 2 = https://w2.weather.gov/climate/xmacis.php?wfo=lot
}}