2012-04-11_PERMIT FILE - M2012014 ‎(4)‎

• Permit No: M2012014
• IBM Index Class Name: PERMIT FILE
• Doc Date: 4/11/2012
• Doc Name: NEW 112C APPLICATION
• From: PATRICK ENGINEERING
• To: DRMS
• Email Name: TAK
• Media Type: D
• Archive: No

EXHIBIT K
Climate Information
The Pawnee Aggregate site is classified as semi -arid and the area is similar in climate to the Greeley, CO.
Greeley experiences a semi -arid climate (Koppen BSk). High temperatures are generally around 90 °F-
950F (32 °C) in the summer and 40 °F -45 °F (4 °C) in the winter, although there is significant variation. The
hottest days generally occur around the third week of July and the coldest in January. Nighttime lows
are near 60 °F (16 °C) in the summer and around 15 °F -20 °F ( -9 °C) in the winter. Record high temperatures
of 106 °F (41 °C) have been recorded, as have record low temperatures of -25 °F (- 32 °C). The first freeze
typically occurs around October 10 and the last can be as late as May 1. Extra tropical cyclones which
disrupt the weather for the eastern two - thirds of the US often originate in or near Colorado, which
means Greeley does not experience many fully developed storm systems. Warm fronts, sleet, and
freezing rain are practically non - existent here. In addition, the city's proximity to the Rocky Mountains
and lower elevation, compared to the mountains west of the city, result in less precipitation and fewer
thunderstorms. This is paradoxical, because adjacent areas (mostly farmland) experience between 7 and
9 hail days per year. The climate in Greeley, as well as all of Colorado, is extremely dry. The Chinook
winds coming off the mountains often raise temperatures to near 70 °F (21 °C) in January and
February, and sometimes to near 90 °F (32°C) in April. Greeley's elevation and low year -round
humidity means that nighttime low temperatures are practically never above 68 °F (20 °C), even in the
very hottest part of the summer. The diurnal temperature range is usually rather wide, with a 50-
degree (Fahrenheit) difference between daytime high and nighttime low not uncommon, especially
in the spring and fall months. Rapid fluctuation in temperature is also common -a sunny 80°F (27°C)
October afternoon can easily give way to a 28 °F ( -2 °C) night.
Climate data for Greeley, Colorado
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 74 76 82 91 96
(23) (24) (28) (33) (36)
103 106 102 99 91 80 75 (06
(39) (41) 139► (37) (33) (27) (24) (41)
Average high °F e 40.0 46.2 55.0 63.0 72.3 83.1 88.7 86.6 78.2 66.0 49.7 41.3 64.18
(4.4) (7.9) (12.8) (17.2) (22.4) (28.4) (31.5) (30.3) (25.7) (18.9) (9.8) (5.2) (17.88)
Average low °F (° 15.6 20.9 28.0 35.8 45.4 54.2 59.3 57.5 48.2 36.9 25.4 17.2 37.03
C) (-9.1) (-6.2) ( -2.2) (2.1) (7.4) (12.3) (15.2) (14.2) (9.0) (2.7) ( -3.7) ( -8.2) (2.80)
Record low °F (°C) -25 -20 -4 -3 25 35 42 41 17 5 -7 -24 1 5
1 32) ( 29) ( -20) ( -19) (-4) (2) (6) (5) ( -8) ( -15) ( -22) ( - 31) (-32)
Precipitation inches 0.53 0.38 1.16 1.81 2.55 1.80 1.42 1.18 1.19 0.89 0.84 0.47 14.22
(mm) (13.5) (9.7) (29.5) (46) (64.8) (45.7) (36.1) (30) (30.2) (22.6) (21.3) (11.9) (361.2)
Snowfall inches 6.5 4.4 7.8 6.3 0.8 0 0 0 0.9 2.6 8.5 5.8 43.6
(cm) (16.5) (112) (19.8) (16) (2) (0) (0) (0) (2.3) (6.6) (21.6) (14.71 (110.7)
Source: NOAA 1al