Editing Duncan, Arizona (section)

==Geography==
[[U.S. Route 70]] passes through downtown, leading west {{convert|39|mi}} to [[Safford, Arizona]], and southeast {{convert|35|mi}} to [[Lordsburg, New Mexico]], and [[Interstate 10]]. [[Arizona State Route 75]] leads north from Duncan {{convert|28|mi}} to [[Clifton, Arizona|Clifton]].

According to the [[United States Census Bureau]], the town of Duncan has a total area of {{convert|5.6|km2|order=flip}}, all of it land.<ref name="Census 2010"/>

===Climate===
Duncan has a [[semi-arid climate]] ([[Köppen climate classification]] ''BSk'') with huge [[diurnal temperature variation|diurnal temperature ranges]] year-round except during periods of thundery [[North American Monsoon|monsoon]] weather. In April the average diurnal range is as high as {{convert|43.7|F-change|C-change}} and it is only less than {{convert|36|F-change|C-change}} in the often stormy months of July and August when over a third of the year's total rainfall can be expected.

During a typical year 131.6 nights will fall below {{convert|32|F|C}}, but only 7.8 days fail to top {{convert|50|F|C}}, and there are only seven occurrences of nights falling to {{convert|0|F|C|1}} or lower, notably on December 24, 1953, and January 11, 1962, when the record low of {{convert|−2|F|C|1}} was set.

Rainfall is generally scanty outside of the monsoon season, with substantial falls from winter storms being rare, although December 1991 did see {{convert|4.76|in|mm|1|disp=or}} of rain. The wettest month since continuous records began in 1942 has been August 2014 with {{convert|6.17|in|mm|1|disp=or}}, whilst the wettest calendar year has been 1983 with {{convert|18.88|in|mm|1|disp=or}} and the driest 1956 with {{convert|3.49|in|mm|1|disp=or}}.<ref>[[National Weather Service]], Tucson; [http://w2.weather.gov/climate/xmacis.php?wfo=twc NOW Data]</ref> Snowfall is most unusual, with the median being zero and the mean only {{convert|0.5|in|m|3}}. The most snowfall ever in Duncan was {{convert|15.0|in|m|2|disp=or}} during the record Western cold wave of January 1949.
<div style="width:75%;">
{{Weather box
|location = Duncan, Arizona (1971–2000; extremes 1901–2001)
|single line = Yes
|collapsed = Yes
|Jan record high F = 80
|Feb record high F = 85
|Mar record high F = 95
|Apr record high F = 100
|May record high F = 108
|Jun record high F = 111
|Jul record high F = 110
|Aug record high F = 107
|Sep record high F = 103
|Oct record high F = 99
|Nov record high F = 87
|Dec record high F = 78
|year record high F = 111
|Jan high F = 60.0
|Feb high F = 65.0
|Mar high F = 71.0
|Apr high F = 79.3
|May high F = 87.7
|Jun high F = 96.9
|Jul high F = 97.1
|Aug high F = 94.4
|Sep high F = 90.1
|Oct high F = 80.3
|Nov high F = 68.2
|Dec high F = 59.6
|year high F = 79.1
|Jan low F = 23.7
|Feb low F = 26.5
|Mar low F = 31.0
|Apr low F = 35.6
|May low F = 44.6
|Jun low F = 53.6
|Jul low F = 63.3
|Aug low F = 62.2
|Sep low F = 54.2
|Oct low F = 41.0
|Nov low F = 28.5
|Dec low F = 22.9
|year low F = 40.6
|Jan record low F = −2
|Feb record low F = −1
|Mar record low F = 9
|Apr record low F = 13
|May record low F = 22
|Jun record low F = 32
|Jul record low F = 42
|Aug record low F = 39
|Sep record low F = 34
|Oct record low F = 17
|Nov record low F = 6
|Dec record low F = −2
|year record low F = −2
|Jan rain inch = 0.96
|Feb rain inch = 0.94
|Mar rain inch = 0.62
|Apr rain inch = 0.24
|May rain inch = 0.38
|Jun rain inch = 0.38
|Jul rain inch = 2.26
|Aug rain inch = 2.18
|Sep rain inch = 1.06
|Oct rain inch = 1.30
|Nov rain inch = 0.77
|Dec rain inch = 1.19
|rain colour = green
|Jan rain days = 5.0
|Feb rain days = 4.5
|Mar rain days = 4.1
|Apr rain days = 1.5
|May rain days = 1.9
|Jun rain days = 2.2
|Jul rain days = 8.5
|Aug rain days = 8.5
|Sep rain days = 4.6
|Oct rain days = 4.4
|Nov rain days = 2.9
|Dec rain days = 4.7
|unit rain days = 0.01 inch
|source 1 = National Oceanic and Atmospheric Administration<ref name=NOAA>{{cite web
|url=http://cdo.ncdc.noaa.gov/climatenormals/clim20/az/022754.pdf
|title=DUNCAN, AZ
|publisher=[[National Oceanic and Atmospheric Administration]]
|access-date=May 14, 2016
}}{{Dead link|date=December 2019 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
}}
</div>