Standard daily pan evaporation is measured using the four-foot diameter Class A evaporation pan. The pan water level reading is adjusted when precipitation is measure to obtain the actual evaporation. Most Class A pans are installed aboveground, allowing effects such as radiation on the side walls and heat exchnges with the pan material. These effects tend to increase the evaporation totals. The amounts can then be adjusted by multiplying the totals b 0.70 or 0.80 to more closely estimate the evaporation from naturally existing urfaces such as a shallow lake, wet soil or other moist natural surfaces.
Many stations do not measure pan evaportation during winter months. A "0.00" total indicates no measuement is taken.
Stations marked with an asterisk * have estimated totals computed from meteorological measurements using a form of the Penman equation.
period of record |
jan |
feb |
mar |
apr |
may |
jun |
july |
aug |
sept |
oct |
nov |
dec |
year |
|
Akron 4 E |
1918-2002 |
M | M | M | 7.30 | 9.41 | 11.56 | 13.43 | 11.24 | 9.09 | 6.16 | M | M | 68.19 |
Alamosa WSO Airport |
1948-2002 |
M | M | M | 7.06 | 9.01 | 10.08 | 9.16 | 7.81 | 6.39 | 4.39 | M | M | 53.90 |
Bonny Lake |
1949-2002 |
M | M | M | 7.26 | 8.70 | 10.96 | 11.98 | 10.71 | 8.10 | 6.12 | 4.57 | M | 68.40 |
Colorado Springs Airport * |
2.40 | 2.50 | 3.80 | 5.90 | 7.90 | 9.40 | 9.50 | 8.60 | 6.70 | 5.10 | 3.00 | 2.40 | 67.20 | |
Denver Airport * |
2.20 | 2.30 | 3.80 | 5.70 | 7.40 | 9.00 | 9.80 | 9.10 | 6.60 | 4.80 | 2.70 | 2.20 | 65.70 | |
Fort Collins |
1900-2002 |
M | M | 2.50 | 4.56 | 5.40 | 6.38 | 6.99 | 6.09 | 4.74 | 3.07 | 1.48 | M | 41.21 |
Grand Junction Airport * |
1.90 | 2.10 | 4.30 | 6.60 | 9.90 | 12.50 | 13.00 | 11.10 | 8.20 | 5.40 | 2.50 | 1.30 | 78.80 | |
Grand Junction 6 ESE |
1962-2002 |
M | M | M | 6.68 | 9.27 | 11.81 | 12.03 | 10.23 | 7.45 | 4.63 | 2.09 | M | 64.19 |
Grand Lake 6 SSW |
1948-2002 |
M | M | M | M | 4.82 | 7.75 | 7.81 | 6.79 | 5.24 | 3.10 | M | M | 35.51 |
Lake George 8 SW |
1948-2002 |
M | M | M | M | 5.15 | 8.26 | 7.39 | 6.02 | 5.72 | M | M | M | 32.54 |
Meredith |
1963-2002 |
M | M | M | M | 7.69 | 8.26 | 8.33 | 6.92 | 5.25 | 3.21 | M | M | 39.66 |
Montrose 1 |
1948-1982 |
1.68 | 1.49 | 3.34 | 5.69 | 7.49 | 9.47 | 9.04 | 7.39 | 5.54 | 3.45 | 1.61 | 1.26 | 57.45 |
Olathe 4 SSW |
1983-1985 |
M | M | M | M | M | 9.37 | 6.87 | 7.23 | 3.31 | M | M | M | 26.78 |
Pueblo WSO Airport |
1954-2002 |
M | M | M | 8.71 | 9.48 | 11.55 | 12.17 | 10.48 | 8.16 | 6.14 | M | M | 66.69 |
Pueblo City Reservoir |
1948-1971 |
M | 5.13 | 5.86 | 6.85 | 8.81 | 10.09 | 10.60 | 8.85 | 7.43 | 5.30 | 2.99 | 2.71 | 74.62 |
Pueblo Reservoir |
1975-2002 |
M | M | M | 7.18 | 9.31 | 11.07 | 11.72 | 10.05 | 7.90 | 5.75 | M | M | 62.98 |
Pueblo 6 SSW |
1971-1985 |
M | M | 4.82 | 7.47 | 8.57 | 10.65 | 11.30 | 9.40 | 7.13 | 5.53 | M | M | 64.87 |
Springfield 7 WSW |
1956-2002 |
M | M | M | 7.85 | 9.73 | 11.44 | 12.69 | 11.28 | 8.53 | 6.29 | 4.57 | M | 72.38 |
Sugarloaf Reservoir |
1948-2002 |
M | M | M | M | M | 7.03 | 6.15 | 4.97 | 4.15 | 2.93 | M | M | 25.23 |
Trinidad Lake |
1989-2002 |
2.47 | 3.05 | 5.58 | 7.09 | 9.09 | 10.85 | 10.25 | 8.55 | 7.65 | 6.19 | 3.63 | 2.21 | 76.61 |
Twin Lakes Evaporation |
1965-1967 |
M | M | M | M | M | M | 7.17 | 6.21 | 3.83 | 3.17 | M | M | 20.38 |
TWIN Lakes Reservoir |
1949-2002 |
M | M | M | M | 6.93 | 8.68 | 7.92 | 6.79 | 5.33 | 3.96 | M | M | 39.61 |
Vallecito Dam |
1948-2002 |
M | M | 1.91 | 3.81 | 5.31 | 6.19 | 6.10 | 5.32 | 4.40 | 3.04 | 1.60 | M | 37.68 |
Wagon Wheel GAP 3 N |
1948-1972 |
M | M | M | M | 6.69 | 7.90 | 7.15 | 5.81 | 5.30 | 2.61 | M | M | 35.46 |
Wiggins 7 SW |
1960-1971 |
M | M | M | 6.82 | 8.50 | 8.42 | 9.97 | 8.09 | 5.87 | 4.22 | 2.23 | M | 54.12 |
date or year |
location |
value |
|
Record Highest Temp |
11
Jul 1888 |
Bennett |
118.00 |
Record Lowest Temp |
1-Feb-85 |
Maybell |
-61.00 |
Highest Average Annual Temp |
Eversoll
Ranch |
56.40 |
|
Lowest Average Annual Temp |
Berthoud
Pass |
29.20 |
|
Consecutive Days Max >=
70 |
Jun-Sep
1983 |
Las
Animas |
76
days |
Consecutive Days Min <=
32 |
Aug
85-Jun 86 |
Taylor
Park |
310
days |
Record Maximum Annual Precip |
1897 |
Ruby |
92.84 |
Record Minimum Annual Precip |
1939 |
Buena
Vista |
1.69 |
Record Maximum 24-hour Precip |
17-Jun-65 |
Holly |
11.08 |
Highest Average Annual Precip |
Wolf
Creek Pass 1 E |
45.35 |
|
Lowest Average Annual Precip |
Center
4 SSW |
7.05 |
|
Consecutive Days Measurable
Precip |
Nov
83-Jan 84 |
Berthoud
Pass |
45
days |
Consecutive Days with no
Measurable Precip |
Oct
36-Mar 37 |
Haswell |
156
days |
Record Maximum Winter Snowfall |
1978-79 |
Wolf
Creek Pass 1 E |
807.00 |
Record Maximum 1-Day Snowfall |
14-15
Apr 1921 |
Silver
Lake |
75.80 |
Highest Average Annual Snowfall |
Wolf
Creek Pass 1 E |
434.80 |
(mean monthly & annual number of hrs with measurable precip with % of hrs and maximum 1-hr totals)
* = Less than 1/2 hour
Maximum 1-hour totals are based on data from top of the hour. Maximum 60-minute totals will be greater.
period of record |
jan |
feb |
mar |
apr |
may |
jun |
july |
aug |
sept |
oct |
nov |
dec |
year |
hour |
inches |
|
Alamosa |
1950-1999 |
13 |
12 |
16 |
16 |
17 |
14 |
21 |
25 |
19 |
18 |
14 |
15 |
199 |
2 |
1.39 |
Colorado Springs |
1975-1999 |
14 |
16 |
33 |
38 |
45 |
31 |
30 |
39 |
24 |
21 |
18 |
19 |
328 |
4 |
2.78 |
Denver |
1948-1994 |
26 |
28 |
48 |
45 |
50 |
28 |
24 |
21 |
24 |
27 |
32 |
27 |
380 |
4 |
1.62 |
Grand Junction |
1948-1999 |
27 |
22 |
29 |
23 |
21 |
11 |
11 |
18 |
18 |
23 |
21 |
23 |
247 |
3 |
1.37 |
Pueblo |
1954-1999 |
14 |
14 |
24 |
26 |
26 |
17 |
21 |
21 |
17 |
17 |
16 |
16 |
229 |
3 |
2.94 |
(mean monthly & annual % of possible sunshine)
Only the first order stations record possible sunshine.
For more information click here on Western States, Alaska or Hawaii and Pacific Island
jan |
feb |
mar |
apr |
may |
jun |
july |
aug |
sept |
oct |
nov |
dec |
annual |
|
Denver |
71 | 69 | 69 | 67 | 64 | 70 | 71 | 71 | 74 | 72 | 64 | 67 | 69 |
Grand Junction |
61 | 65 | 65 | 70 | 73 | 81 | 79 | 77 | 79 | 74 | 63 | 61 | 71 |
Pueblo |
75 | 74 | 74 | 74 | 73 | 78 | 79 | 78 | 80 | 79 | 72 | 71 | 76 |