Station Overview Station Location
Station Number CO-AR-321 Latitude 39.570286
Station Name Littleton 5.0 ESE Longitude -104.925979
County Arapahoe Elevation (ft) 5762



Month 30 Yr Avg by PRISM Total Prcp Sum Days Covered By All Observations Daily Prcp Sum Daily Observation Count Multiday Prcp Sum Days Covered by Multiday Observations Multiday Observation Count Days With Prcp Days With Trace Total Snowfall Days With Snowfall Days With Snow On Ground
Oct 18 1.34 1.64 10 1.64 10 0.00 0 0 9 0 5.0 3 3
Nov 18 0.95 0.03 1 0.03 1 0.00 0 0 1 0 0.0 0 0
Dec 18 0.73 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Jan 19 0.55 1.89 8 1.89 8 0.00 0 0 8 0 19.6 8 7
Feb 19 0.56 0.84 2 0.84 2 0.00 0 0 2 0 10.4 2 1
March 19 1.86 2.31 9 2.31 9 0.00 0 0 9 0 14.0 4 4
April 19 2.30 0.89 15 0.89 3 0.00 12 0 3 0 8.2 2 1
May 19 2.63 2.86 21 1.48 7 1.38 14 2 7 0 0.2 1 0
June 19 2.05 1.64 23 1.38 8 0.26 15 1 7 0 0.0 0 0
July 19 2.45 0.83 3 0.83 3 0.00 0 0 3 0 0.0 0 0
Aug 19 2.46 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Sept 19 1.24 2.73 1 2.73 1 0.00 0 0 1 0 0.0 0 0
Water Year Totals: 19.12" 15.66" 93 days 14.02" 52 1.64" 41 days 3 50 days 0 days 57.4" 20 days 16 days



Days in Water Year Cell Color Key
        Daily Observation with Prcp         Missing Day
        Multiday Observation         Daily/Multiday Observation Conflict

Day of Year Daily Prcp Multiday Prcp
10/1/2018
10/2/2018
10/3/2018
10/4/2018
10/5/2018
10/6/2018 0.46
10/7/2018
10/8/2018 0.33
10/9/2018 0.09
10/10/2018 0.07
10/11/2018 0.05
10/12/2018 0.04
10/13/2018 0.00
10/14/2018 0.05
10/15/2018 0.15
10/16/2018
10/17/2018
10/18/2018
10/19/2018
10/20/2018
10/21/2018
10/22/2018
10/23/2018
10/24/2018
10/25/2018
10/26/2018
10/27/2018
10/28/2018
10/29/2018
10/30/2018
10/31/2018 0.40
11/1/2018
11/2/2018
11/3/2018
11/4/2018 0.03
11/5/2018
11/6/2018
11/7/2018
11/8/2018
11/9/2018
11/10/2018
11/11/2018
11/12/2018
11/13/2018
11/14/2018
11/15/2018
11/16/2018
11/17/2018
11/18/2018
11/19/2018
11/20/2018
11/21/2018
11/22/2018
11/23/2018
11/24/2018
11/25/2018
11/26/2018
11/27/2018
11/28/2018
11/29/2018
11/30/2018
12/1/2018
12/2/2018
12/3/2018
12/4/2018
12/5/2018
12/6/2018
12/7/2018
12/8/2018
12/9/2018
12/10/2018
12/11/2018
12/12/2018
12/13/2018
12/14/2018
12/15/2018
12/16/2018
12/17/2018
12/18/2018
12/19/2018
12/20/2018
12/21/2018
12/22/2018
12/23/2018
12/24/2018
12/25/2018
12/26/2018
12/27/2018
12/28/2018
12/29/2018
12/30/2018
12/31/2018
Day of YearDaily PrcpMultiday Prcp
1/1/2019 0.14
1/2/2019
1/3/2019
1/4/2019
1/5/2019
1/6/2019
1/7/2019
1/8/2019
1/9/2019
1/10/2019
1/11/2019 0.19
1/12/2019 0.77
1/13/2019
1/14/2019
1/15/2019
1/16/2019
1/17/2019
1/18/2019
1/19/2019 0.28
1/20/2019
1/21/2019
1/22/2019 0.15
1/23/2019
1/24/2019
1/25/2019 0.14
1/26/2019
1/27/2019
1/28/2019 0.11
1/29/2019 0.11
1/30/2019
1/31/2019
2/1/2019
2/2/2019
2/3/2019
2/4/2019
2/5/2019
2/6/2019
2/7/2019 0.14
2/8/2019
2/9/2019
2/10/2019
2/11/2019
2/12/2019
2/13/2019
2/14/2019
2/15/2019
2/16/2019
2/17/2019
2/18/2019
2/19/2019
2/20/2019
2/21/2019
2/22/2019
2/23/2019 0.70
2/24/2019
2/25/2019
2/26/2019
2/27/2019
2/28/2019
3/1/2019
3/2/2019
3/3/2019 0.30
3/4/2019 0.03
3/5/2019
3/6/2019
3/7/2019 0.12
3/8/2019
3/9/2019 0.04
3/10/2019
3/11/2019
3/12/2019
3/13/2019 0.21
3/14/2019 1.08
3/15/2019
3/16/2019
3/17/2019
3/18/2019
3/19/2019
3/20/2019
3/21/2019
3/22/2019
3/23/2019 0.14
3/24/2019
3/25/2019
3/26/2019
3/27/2019
3/28/2019
3/29/2019
3/30/2019 0.36
3/31/2019 0.03
Day of YearDaily PrcpMultiday Prcp
4/1/2019
4/2/2019
4/3/2019
4/4/2019
4/5/2019
4/6/2019
4/7/2019
4/8/2019
4/9/2019
4/10/2019
4/11/2019 0.72
4/12/2019
4/13/2019 0.15
4/14/2019
4/15/2019
4/16/2019
4/17/2019
4/18/2019 0.02
4/19/2019 **
4/20/2019 **
4/21/2019 **
4/22/2019 **
4/23/2019 **
4/24/2019 **
4/25/2019 **
4/26/2019 **
4/27/2019 **
4/28/2019 **
4/29/2019 **
4/30/2019 **
5/1/2019 **
5/2/2019 0.36
5/3/2019
5/4/2019
5/5/2019
5/6/2019
5/7/2019 0.07
5/8/2019 0.25
5/9/2019 0.56
5/10/2019 0.06
5/11/2019 **
5/12/2019 **
5/13/2019 **
5/14/2019 **
5/15/2019 **
5/16/2019 **
5/17/2019 **
5/18/2019 **
5/19/2019 **
5/20/2019 **
5/21/2019 **
5/22/2019 1.02
5/23/2019 0.03
5/24/2019
5/25/2019
5/26/2019
5/27/2019 0.43
5/28/2019
5/29/2019 0.08
5/30/2019
5/31/2019
6/1/2019 0.05
6/2/2019 0.09
6/3/2019 0.01
6/4/2019 0.08
6/5/2019 **
6/6/2019 **
6/7/2019 **
6/8/2019 **
6/9/2019 **
6/10/2019 **
6/11/2019 **
6/12/2019 **
6/13/2019 **
6/14/2019 **
6/15/2019 **
6/16/2019 **
6/17/2019 **
6/18/2019 **
6/19/2019 0.26
6/20/2019 0.00
6/21/2019 0.03
6/22/2019 0.48
6/23/2019 0.64
6/24/2019
6/25/2019
6/26/2019
6/27/2019
6/28/2019
6/29/2019
6/30/2019
Day of YearDaily PrcpMultiday Prcp
7/1/2019 0.13
7/2/2019 0.35
7/3/2019
7/4/2019
7/5/2019 0.35
7/6/2019
7/7/2019
7/8/2019
7/9/2019
7/10/2019
7/11/2019
7/12/2019
7/13/2019
7/14/2019
7/15/2019
7/16/2019
7/17/2019
7/18/2019
7/19/2019
7/20/2019
7/21/2019
7/22/2019
7/23/2019
7/24/2019
7/25/2019
7/26/2019
7/27/2019
7/28/2019
7/29/2019
7/30/2019
7/31/2019
8/1/2019
8/2/2019
8/3/2019
8/4/2019
8/5/2019
8/6/2019
8/7/2019
8/8/2019
8/9/2019
8/10/2019
8/11/2019
8/12/2019
8/13/2019
8/14/2019
8/15/2019
8/16/2019
8/17/2019
8/18/2019
8/19/2019
8/20/2019
8/21/2019
8/22/2019
8/23/2019
8/24/2019
8/25/2019
8/26/2019
8/27/2019
8/28/2019
8/29/2019
8/30/2019
8/31/2019
9/1/2019
9/2/2019
9/3/2019
9/4/2019
9/5/2019
9/6/2019
9/7/2019 2.73
9/8/2019
9/9/2019
9/10/2019
9/11/2019
9/12/2019
9/13/2019
9/14/2019
9/15/2019
9/16/2019
9/17/2019
9/18/2019
9/19/2019
9/20/2019
9/21/2019
9/22/2019
9/23/2019
9/24/2019
9/25/2019
9/26/2019
9/27/2019
9/28/2019
9/29/2019
9/30/2019



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/6/2018 7:00 AM 0.46 M M M M
10/8/2018 7:00 AM 0.33 M M M M
10/9/2018 7:00 AM 0.09 M M M M
10/10/2018 7:00 AM 0.07 M M M M
10/11/2018 7:00 AM 0.05 M M M M
10/12/2018 7:00 AM 0.04 M M M M
10/13/2018 7:00 AM 0.00 0.0 M M M
10/14/2018 7:00 AM 0.05 0.5 0.05 0.5 M First snowflakes began falling at around 2AM, preceded by freezing rain/drizzle,, coating my gauge with a thin layer of ice. The most intense snowfall so far occurred right about 7 AM, when I took my reading. I am writing this report a 8AM, and snowfall has diminished to a very light rate.
10/15/2018 7:00 AM 0.15 2.5 M 3.0 M
10/31/2018 7:00 AM 0.40 2.0 M 2.0 M Wet snowflakes ceased falling just prior (at 6:30am) to observation time. Much of the snow melted as it arrived, so certainly more fell than the 2 inches that I measured during the past 24 hours
11/4/2018 7:00 AM 0.03 M M M M
1/1/2019 7:00 AM 0.14 1.6 0.14 1.6 M
1/11/2019 7:00 AM 0.19 1.3 0.19 1.3 0.19 Light snow at obs time. Very small but wet flakes. 35 degrees F
1/12/2019 7:00 AM 0.77 6.2 0.77 7.6 0.95 .96 or nearly an inch, for the 2 day storm. This was a warm, wet snow - unusual for January. Jan is statistically our driest month here in Littleton,
1/19/2019 7:00 AM 0.28 2.7 0.28 2.5 M
1/22/2019 7:00 AM 0.15 1.8 0.15 M M
1/25/2019 7:00 AM 0.14 2.0 0.14 5.5 1.19
1/28/2019 7:00 AM 0.11 2.7 0.11 8.0 M Through 7AM today, Jan 28, I have measured 18.5 inches of snow with a water content of 1.78 inches. This would make Jan 2019 the wettest in my 60+ years of weather watching in Littleton CO. There were 7 separate snow events. Two of the snow events were spring-like, with wet slushy snow.
1/29/2019 7:00 AM 0.11 1.3 0.11 8.3 M
2/7/2019 7:00 AM 0.14 2.4 0.14 M M Dry, powder snow. Temp 0.0F at 7AM
2/23/2019 7:00 AM 0.70 8.0 0.70 8.0 M Gentle snowfall beginning at 4:15PM. Light snow continued until 3AM. No wind, no drifting.
3/3/2019 7:00 AM 0.30 3.9 0.30 3.9 0.30
3/4/2019 7:00 AM 0.03 0.1 0.03 3.5 0.30
3/7/2019 7:00 AM 0.12 M M M M Unusual for my location. Woke up this morning to a strong 1/10th inch ice on surfaces. I was asleep when it fell, so I don’t know the character of the “winter mix”, but judging from the texture of the ice coating, I would say mostly frozen rain with some sleet. At 7AM, liquid water is rapidly dripping from the trees. Temp. 36F
3/9/2019 7:00 AM 0.04 M M M M Brief rain shower began about 8:45PM last night. Remained as liquid in my tube; 34F at the time I collected the measurement.
3/13/2019 7:00 AM 0.21 M M M M Rain commenced at 5:53AM; a steady rain and by 7AM 0.21 measured. 38F. Calm wind.
3/14/2019 7:00 AM 1.08 8.0 1.08 8.0 0.81 Wet, dense snow. In my 4 inch tube, I measured 1.08 in of liquid. Some of this was rain, or snow that melted upon contact early in the storm. The core sample, consisting of 8 in of snow, melted to .81 in liquid.
3/23/2019 7:00 AM 0.14 M M M M All liquid rain. Some rumbles of thunder during the afternoon yesterday
3/30/2019 7:00 AM 0.36 2.0 M 2.0 M Rain began about 5 pm yesterday, soon turned to rain/snow mix, then all snow. At 7 am today, total liquid from the rain and snow 0.36. Two inches of snow on the board, and snowing light-to-moderate currently
3/31/2019 7:00 AM 0.03 M M M M
4/11/2019 7:00 AM 0.72 7.2 0.61 7.2 0.61 Rain measuring 0.11 fell prior to 1PM, then snow began falling, continuing into weds night. Though some snow melted upon falling, measured 7.2 inches at 7AM. Total rain and melted snow: 0.72”. At observation time, temp of 16F; engendering some concern for vulnerable fruit trees.
4/13/2019 7:00 AM 0.15 1.0 0.11 M M
4/18/2019 7:00 AM 0.02 M M M M
5/7/2019 7:00 AM 0.07 M M M M
5/8/2019 7:00 AM 0.25 M M M M
5/9/2019 7:00 AM 0.56 0.2 M M M Rain changed to snow after dawn this morning. Snowing at obs time
5/10/2019 7:00 AM 0.06 M M M M
5/23/2019 7:00 AM 0.03 M M M M
5/27/2019 7:00 AM 0.43 M M M M Little bit late getting my 7 AM observation in. Took a trip to Boulder the morning for the BB 10k. Two episodes yesterday. At about 4PM shower 0.10”, quiet. At 8:40 PM another cell popped up right over our location. Almost steady thunder and lightning for 30 minutes. 0.33”. Some very small hail in the 4 PM shower - no damage.
5/29/2019 7:00 AM 0.08 M M M M
6/1/2019 7:00 AM 0.05 M M M M
6/2/2019 7:00 AM 0.09 M M M M
6/3/2019 7:00 AM 0.01 M M M M
6/4/2019 7:00 AM 0.08 M M M M
6/20/2019 7:00 AM 0.00 0.0 M M M
6/21/2019 7:00 AM 0.03 M M M M
6/22/2019 7:00 AM 0.48 M M M M Light rain at time of observation
6/23/2019 7:00 AM 0.64 M M M M
7/1/2019 7:00 AM 0.13 M M M M
7/2/2019 7:00 AM 0.35 M M M M
7/5/2019 7:00 AM 0.35 M M M M
9/7/2019 7:00 AM 2.73 M M M M Wow. After 3 summer months seeing puny thunderstorms here, the big one hit Friday afternoon. Rain fell for over an hour, torrential at times. Three waves of hail during the storm - stones ranged in size from rice, to pea, to small marble. Hail damage to garden moderate. Winds during the storm were light, so we did not see “stripping” damage to trees, although numerous whole leaves were knocked off some trees. (Edit to add) After reviewing other reports this morning, surprised that the storm at my station was so localized. But I am very confident in the accuracy of my measurement.



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
4/19/2019 5/02/2019 7:00 AM 14 0.36 M M Away from my home station Apr 19 to May, 1, 2019. (I was at my farm in Wisconsin). Found .36 inches in the gauge upon return)
5/11/2019 5/22/2019 1:00 PM 12 1.02 M M I was at my Wisconsin farm during the “May snow event”. I have some confidence in the accuracy of this multi-day reading, as it is corroborated by measurements at nearby stations
6/5/2019 6/19/2019 7:00 AM 15 0.26 M M



Observation Date Observation Time Notes Largest Stone Size Average Stone Size Smallest Stone Size Stone Consistency Duration Minutes Durration Accuracy Damage Timing More Rain than Hail Hail Started Largest Hail Started Angle of Impact Number of Stones on Pad Distance Between Stones on Pad Depth of Stones on Ground
9/6/2019 3:15 PM 3/8" 1/4" Pea Size Rice Mixed|Clear Ice|White Ice 10 2min minor leaf damage Intermittent True After rain After smaller hail 10-20 0.5