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Callao, Utah
Callao, Utah is located in Utah
Callao, Utah
Callao, Utah
Location in Utah
Callao, Utah is located in the United States
Callao, Utah
Callao, Utah
Location in the United States
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(s) 435
GNIS feature ID 1437516

Callao (pronounced KAL-ee-oh) is a small community located in the western part of Utah, United States. It sits right on the border of Juab and Tooele counties, in a place called Snake Valley.

What is Callao, Utah?

Callao is a quiet community in western Utah. It's known for its history, especially its connection to the famous Pony Express. This area was once a busy stop for mail carriers riding horses across the country.

A Stop on the Pony Express Trail

Back in 1860, Callao was first known as Willow Springs. It was an important stop along the original Pony Express route. This was a super-fast mail service that used riders on horseback to deliver letters across the American West.

In 1870, a family named Tripp – E. W. Tripp, his wife, and their son – became the first people to live there permanently.

How Callao Got Its Name

By 1895, people decided that "Willow Springs" was too common. They wanted a unique name for their community. An old prospector, who worked near Gold Hill, suggested the name Callao.

He thought the area looked a lot like Callao, Peru, a large port city in South America. So, that's how this small Utah community got its interesting name!

What's the Weather Like in Callao?

Callao has a semi-arid climate. This means it's generally dry, but not a full desert. It gets some rain and snow, but not a lot.

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
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