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Callao, Utah
Callao, Utah
Unincorporated community
	Callao Callao
	Coordinates: 39°53′52″N 113°42′31″W / 39.89778°N 113.70861°W
Country	United States
State	Utah
County	Juab
Settled	1860
Named for	Callao
Elevation	4,337 ft (1,322 m)
Time zone	UTC-7 (Mountain (MST))
• Summer (DST)	UTC-6 (MDT)
ZIP code	84034
Area code	435
GNIS feature ID	1437516

Callao (/ˈkælioʊ/ KAL-ee-oh) is a community in northern Snake Valley, along the border of Juab and Tooele counties, Utah, United States.

Description

The community was part of the original Pony Express overland route, and was first called Willow Springs in 1860. E. W. Tripp, his wife, and their son were the first to establish residence there, in 1870. In 1895 it was decided that Willow Springs was too common a name, and a new name would be chosen. The name Callao was chosen because of a resemblance to Callao, Peru, suggested by an old grizzled 1890s prospector in the region who was working out of Gold Hill to the north.^[2]

Climate

According to the Köppen Climate Classification system, Callao has a semi-arid climate, abbreviated "BSk" on climate maps.^[3]

Climate data for Callao, Utah (1991–2020 normals, extremes 1902–1905 and 1962–present)
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Record high °F (°C)	69 (21)	74 (23)	84 (29)	89 (32)	96 (36)	100 (38)	104 (40)	106 (41)	99 (37)	90 (32)	77 (25)	72 (22)	106 (41)
Mean maximum °F (°C)	55.2 (12.9)	61.8 (16.6)	73.7 (23.2)	81.3 (27.4)	88.2 (31.2)	94.9 (34.9)	99.0 (37.2)	97.4 (36.3)	92.3 (33.5)	82.4 (28.0)	69.1 (20.6)	59.6 (15.3)	99.6 (37.6)
Mean daily maximum °F (°C)	37.9 (3.3)	45.2 (7.3)	56.2 (13.4)	63.1 (17.3)	72.1 (22.3)	82.4 (28.0)	90.7 (32.6)	89.1 (31.7)	79.3 (26.3)	65.2 (18.4)	50.3 (10.2)	39.0 (3.9)	64.2 (17.9)
Daily mean °F (°C)	26.1 (−3.3)	32.8 (0.4)	41.6 (5.3)	48.4 (9.1)	56.9 (13.8)	66.0 (18.9)	74.1 (23.4)	72.2 (22.3)	62.0 (16.7)	48.7 (9.3)	36.3 (2.4)	26.9 (−2.8)	49.3 (9.6)
Mean daily minimum °F (°C)	14.3 (−9.8)	20.4 (−6.4)	27.0 (−2.8)	33.7 (0.9)	41.7 (5.4)	49.5 (9.7)	57.5 (14.2)	55.3 (12.9)	44.7 (7.1)	32.3 (0.2)	22.2 (−5.4)	14.8 (−9.6)	34.5 (1.4)
Mean minimum °F (°C)	−2.2 (−19.0)	5.5 (−14.7)	14.9 (−9.5)	20.9 (−6.2)	29.4 (−1.4)	37.6 (3.1)	46.6 (8.1)	44.7 (7.1)	32.1 (0.1)	19.6 (−6.9)	8.1 (−13.3)	1.1 (−17.2)	−5.0 (−20.6)
Record low °F (°C)	−24 (−31)	−23 (−31)	2 (−17)	8 (−13)	19 (−7)	30 (−1)	36 (2)	28 (−2)	20 (−7)	2 (−17)	−2 (−19)	−23 (−31)	−24 (−31)
Average precipitation inches (mm)	0.48 (12)	0.44 (11)	0.52 (13)	0.78 (20)	1.03 (26)	0.55 (14)	0.37 (9.4)	0.48 (12)	0.55 (14)	0.65 (17)	0.38 (9.7)	0.38 (9.7)	6.61 (168)
Average snowfall inches (cm)	3.6 (9.1)	2.2 (5.6)	0.9 (2.3)	0.6 (1.5)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	1.2 (3.0)	3.5 (8.9)	12.0 (30)
Average precipitation days (≥ 0.01 in)	4.8	4.0	4.5	6.2	7.0	3.8	3.9	4.1	4.0	4.1	3.2	3.7	53.3
Average snowy days (≥ 0.1 in)	2.4	1.3	0.8	0.2	0.0	0.0	0.0	0.0	0.0	0.1	0.7	2.3	7.8
Source: NOAA^[4]^[5]