Station Overview Station Location
Station Number MD-CV-1 Latitude 38.741818
Station Name Marlton 6.0 E Longitude -76.680712
County Calvert Elevation (ft) 39



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 19 3.50 3.95 6 3.95 6 0.00 0 0 6 0 0.0 0 0
Nov 19 3.39 1.95 7 1.95 7 0.00 0 0 7 0 0.0 0 0
Dec 19 3.35 2.40 8 2.40 8 0.00 0 0 8 0 0.0 0 0
Jan 20 3.05 2.49 5 2.49 5 0.00 0 0 5 0 0.3 1 0
Feb 20 2.80 2.97 13 2.97 13 0.00 0 0 13 0 0.0 0 0
March 20 3.82 2.48 13 2.48 13 0.00 0 0 13 0 0.0 0 0
April 20 3.32 4.48 11 4.48 11 0.00 0 0 11 0 0.0 0 0
May 20 4.23 3.14 9 3.14 9 0.00 0 0 9 0 0.0 0 0
June 20 3.91 3.86 9 3.86 9 0.00 0 0 9 0 0.0 0 0
July 20 4.00 7.53 11 7.53 11 0.00 0 0 11 0 0.0 0 0
Aug 20 3.49 14.32 17 14.32 17 0.00 0 0 17 0 0.0 0 0
Sept 20 3.83 3.68 6 3.68 6 0.00 0 0 6 0 0.0 0 0
Water Year Totals: 42.69" 53.25" 115 days 53.25" 115 0.00" 0 days 0 115 days 0 days 0.3" 1 days 0 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
10/1/2019 0.27
10/2/2019
10/3/2019
10/4/2019
10/5/2019
10/6/2019
10/7/2019
10/8/2019
10/9/2019
10/10/2019
10/11/2019
10/12/2019
10/13/2019
10/14/2019 0.04
10/15/2019
10/16/2019
10/17/2019 1.60
10/18/2019
10/19/2019
10/20/2019
10/21/2019
10/22/2019
10/23/2019 0.51
10/24/2019
10/25/2019
10/26/2019
10/27/2019
10/28/2019 1.32
10/29/2019
10/30/2019
10/31/2019 0.21
11/1/2019 0.44
11/2/2019
11/3/2019
11/4/2019
11/5/2019
11/6/2019
11/7/2019
11/8/2019 0.11
11/9/2019
11/10/2019
11/11/2019
11/12/2019 0.07
11/13/2019 0.12
11/14/2019
11/15/2019
11/16/2019
11/17/2019
11/18/2019
11/19/2019 0.27
11/20/2019
11/21/2019
11/22/2019
11/23/2019 0.25
11/24/2019 0.69
11/25/2019
11/26/2019
11/27/2019
11/28/2019
11/29/2019
11/30/2019
12/1/2019
12/2/2019 0.46
12/3/2019 0.10
12/4/2019
12/5/2019
12/6/2019
12/7/2019
12/8/2019
12/9/2019 0.10
12/10/2019 0.52
12/11/2019 0.31
12/12/2019
12/13/2019
12/14/2019 0.42
12/15/2019 0.03
12/16/2019
12/17/2019
12/18/2019
12/19/2019
12/20/2019
12/21/2019
12/22/2019
12/23/2019
12/24/2019
12/25/2019
12/26/2019
12/27/2019
12/28/2019
12/29/2019
12/30/2019 0.46
12/31/2019
Day of YearDaily PrcpMultiday Prcp
1/1/2020
1/2/2020
1/3/2020
1/4/2020
1/5/2020
1/6/2020
1/7/2020
1/8/2020 0.37
1/9/2020
1/10/2020
1/11/2020
1/12/2020 0.68
1/13/2020
1/14/2020
1/15/2020 0.07
1/16/2020
1/17/2020
1/18/2020
1/19/2020 0.26
1/20/2020
1/21/2020
1/22/2020
1/23/2020
1/24/2020
1/25/2020 1.11
1/26/2020
1/27/2020
1/28/2020
1/29/2020
1/30/2020
1/31/2020
2/1/2020 0.03
2/2/2020 0.06
2/3/2020
2/4/2020
2/5/2020
2/6/2020 0.15
2/7/2020 0.95
2/8/2020 0.16
2/9/2020
2/10/2020
2/11/2020 0.68
2/12/2020 0.14
2/13/2020 0.10
2/14/2020 0.18
2/15/2020
2/16/2020
2/17/2020
2/18/2020
2/19/2020 0.02
2/20/2020
2/21/2020
2/22/2020
2/23/2020
2/24/2020
2/25/2020 0.13
2/26/2020 0.17
2/27/2020 0.20
2/28/2020
2/29/2020
3/1/2020
3/2/2020
3/3/2020 0.08
3/4/2020 0.08
3/5/2020
3/6/2020
3/7/2020 0.10
3/8/2020
3/9/2020
3/10/2020
3/11/2020
3/12/2020
3/13/2020 0.42
3/14/2020
3/15/2020 0.17
3/16/2020
3/17/2020
3/18/2020
3/19/2020 0.46
3/20/2020
3/21/2020 0.26
3/22/2020
3/23/2020 0.11
3/24/2020 0.19
3/25/2020 0.04
3/26/2020 0.18
3/27/2020
3/28/2020 0.26
3/29/2020 0.13
3/30/2020
3/31/2020
Day of YearDaily PrcpMultiday Prcp
4/1/2020 0.11
4/2/2020
4/3/2020
4/4/2020
4/5/2020
4/6/2020
4/7/2020
4/8/2020 0.20
4/9/2020 0.11
4/10/2020
4/11/2020
4/12/2020
4/13/2020 0.94
4/14/2020 0.47
4/15/2020 0.39
4/16/2020
4/17/2020
4/18/2020
4/19/2020
4/20/2020
4/21/2020
4/22/2020
4/23/2020
4/24/2020 1.61
4/25/2020 0.04
4/26/2020 0.40
4/27/2020 0.18
4/28/2020
4/29/2020 0.03
4/30/2020
5/1/2020 1.24
5/2/2020 0.08
5/3/2020
5/4/2020 0.94
5/5/2020
5/6/2020 0.18
5/7/2020 0.09
5/8/2020
5/9/2020 0.19
5/10/2020
5/11/2020 0.01
5/12/2020
5/13/2020
5/14/2020
5/15/2020
5/16/2020
5/17/2020
5/18/2020
5/19/2020
5/20/2020
5/21/2020
5/22/2020
5/23/2020
5/24/2020
5/25/2020
5/26/2020
5/27/2020
5/28/2020 0.08
5/29/2020 0.33
5/30/2020
5/31/2020
6/1/2020
6/2/2020
6/3/2020
6/4/2020
6/5/2020 0.25
6/6/2020 0.52
6/7/2020
6/8/2020
6/9/2020
6/10/2020
6/11/2020
6/12/2020 0.17
6/13/2020
6/14/2020
6/15/2020
6/16/2020
6/17/2020
6/18/2020 0.65
6/19/2020
6/20/2020
6/21/2020 1.28
6/22/2020 0.56
6/23/2020 0.18
6/24/2020
6/25/2020
6/26/2020 0.12
6/27/2020
6/28/2020 0.13
6/29/2020
6/30/2020
Day of YearDaily PrcpMultiday Prcp
7/1/2020 0.23
7/2/2020 0.17
7/3/2020
7/4/2020
7/5/2020
7/6/2020
7/7/2020 5.26
7/8/2020
7/9/2020
7/10/2020
7/11/2020
7/12/2020 0.22
7/13/2020
7/14/2020 0.51
7/15/2020
7/16/2020
7/17/2020
7/18/2020
7/19/2020
7/20/2020
7/21/2020
7/22/2020 0.11
7/23/2020 0.31
7/24/2020 0.18
7/25/2020 0.18
7/26/2020
7/27/2020
7/28/2020
7/29/2020 0.04
7/30/2020
7/31/2020 0.32
8/1/2020 0.18
8/2/2020
8/3/2020 0.30
8/4/2020 3.75
8/5/2020
8/6/2020 0.09
8/7/2020 0.09
8/8/2020 1.57
8/9/2020
8/10/2020
8/11/2020
8/12/2020
8/13/2020 0.02
8/14/2020 2.52
8/15/2020 0.03
8/16/2020 1.23
8/17/2020 0.05
8/18/2020 0.06
8/19/2020
8/20/2020 0.22
8/21/2020
8/22/2020 0.04
8/23/2020
8/24/2020
8/25/2020
8/26/2020 0.11
8/27/2020
8/28/2020
8/29/2020 2.40
8/30/2020 1.66
8/31/2020
9/1/2020 0.38
9/2/2020
9/3/2020
9/4/2020 0.45
9/5/2020
9/6/2020
9/7/2020
9/8/2020
9/9/2020
9/10/2020
9/11/2020
9/12/2020
9/13/2020
9/14/2020
9/15/2020
9/16/2020
9/17/2020
9/18/2020 0.73
9/19/2020
9/20/2020
9/21/2020
9/22/2020
9/23/2020
9/24/2020
9/25/2020
9/26/2020 1.14
9/27/2020
9/28/2020
9/29/2020 0.08
9/30/2020 0.90



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2019 7:00 AM 0.27 M M M M R- Late mrng/early aftn briefly R/R+ around noon. First measurable rain in 38 days!!!
10/14/2019 7:00 AM 0.04 M M M M Ocnl aftn R-. Only 2nd measurable rain in past 50 days w/ 0.29"! Only 2.44" in past 3 months!
10/17/2019 7:00 AM 1.60 M M M M Generally R mrng/aftn. More rain today than all the rain in the past 2 1/2 months (since Aug.2)! Plants scream "Thank you!"
10/23/2019 7:00 AM 0.51 M M M M Late mrng L-. R-/R Aftn into early eve w/ embedded RW+. 1.70" R Sun. 10/20. 3.85" MTD. Drought is over!
10/28/2019 7:00 AM 1.32 M M M M Late mrng TRW+/RW. 1.62" Event total. 5.47" MTD.
10/31/2019 7:00 AM 0.21 M M M M 0.15" R- Aftn/eve. Lull around midnight then another .06" R- overnight.
11/1/2019 7:00 AM 0.44 M M M M Late eve/early overnite TRW/RW. 0.65" Event total. 6.06" Oct. precip total.
11/8/2019 7:00 AM 0.11 M M M M Late day/eve R-. 0.17" MTD.
11/12/2019 7:00 AM 0.07 M M M M Late night/early mrng R-.
11/13/2019 7:00 AM 0.12 M M M M R- Mrng tapering off to S- early aftn. 0.19" Event total. 0.36" MTD.
11/19/2019 7:00 AM 0.27 M M M M Ocnl R- briefly R eve and early overnight. 0.63" MTD.
11/23/2019 7:00 AM 0.25 M M M M R-/R Early aftn. 0.88" MTD.
11/24/2019 7:00 AM 0.69 M M M M R-/R Late day into overnight. 1.57" MTD.
12/2/2019 7:00 AM 0.46 M M M M R-/R Mrng/aftn.
12/3/2019 7:00 AM 0.10 M M M M Mrng/aftn R-/RW-. 0.56" Event total.
12/9/2019 7:00 AM 0.10 M M M M Late eve L-. Overnight R-.
12/10/2019 7:00 AM 0.52 M M M M R-/R Mrng/aftn/eve.
12/11/2019 7:00 AM 0.31 T M 0.0 M R- Later morning into early overnight briefly R turning to IP- then S- before ending. 0.93" Event total. 1.49" LWE MTD.
12/14/2019 7:00 AM 0.42 M M M M R- w/ dense F.
12/15/2019 7:00 AM 0.03 M M M M Mrng R-/L- w/ dense F then a few later day RW-. 0.45" Event total. 1.94" LWE MTD.
12/30/2019 7:00 AM 0.46 M M M M R-/L- Mrng thru overnight. 2.99" LWE MTD incl. 0.1" IP. 43.17" 2019 total precip.
1/8/2020 7:00 AM 0.37 0.3 M M M R then S aftn til early eve briefly S+ w/ "silver dollar" flakes, caw, caw! 1.08" LWE MTD.
1/12/2020 7:00 AM 0.68 M M M M T Late day RW-. 0.68" Overnight RW- briefly RW+. 1.76" MTD.
1/15/2020 7:00 AM 0.07 M M M M Mrng RW-. 1.83" LWE MTD.
1/19/2020 7:00 AM 0.26 M M M M T Early mrng S-. T Noontime IP-. Aftn/early eve R-. 2.02" LWE MTD.
1/25/2020 8:00 AM 1.11 M M M M R-/R Briefly R+ overnight tapering off in mrng. 3.20" LWE MTD.
2/1/2020 7:00 AM 0.03 M M M M Late day/early eve R-. 3.23" LWE MTD. 0.3" Monthly S/!P. Only 0.4" Seasonal total.
2/2/2020 7:00 AM 0.06 M M M M .05" Eve R-/L-. .01" Overnight RW-.
2/6/2020 7:00 AM 0.15 M M M M Ocnl R-. 0.22" Event total thus far.
2/7/2020 7:00 AM 0.95 M M M M R-/R Thru early overnight. 1.17" Event total thus far.
2/8/2020 7:00 AM 0.16 M M M M Mrng RW- briefly RW. 1.33" Event total. 1.39" MTD.
2/11/2020 8:00 AM 0.68 M M M M Ocnl R-/L-.
2/12/2020 7:00 AM 0.14 M M M M Mrng R-. 0.82" Event total. 2.21" LWE MTD.
2/13/2020 7:00 AM 0.10 M M M M Late day/eve R-. Ocnl RW- overnight then R- redeveloping.
2/14/2020 7:00 AM 0.18 M M M M Mrng R-. 1.10" Weekly total. 2.49" LWE MTD.
2/19/2020 7:00 AM 0.02 M M M M .01" Late aftn RW-. 0.01" Overnight R-. 2.51" LWE MTD.
2/25/2020 8:00 AM 0.13 M M M M Brief RW- overnight then R- developed late night into morning.
2/26/2020 7:00 AM 0.17 M M M M Mrng R- tapering off to aftn L-. 0.30" Event total. 2.81" LWE MTD.
2/27/2020 7:00 AM 0.20 M M M M Late day/eve L-. Brief RW+ late eve and around midnight. R- Early overnight. 3.01" LWE for Feb. No snow!
3/3/2020 7:00 AM 0.08 M M M M T Late aftn RW- squall. .08" Eve R- briefly R.
3/4/2020 7:00 AM 0.08 M M M M .01" Noontime RW-. .07" From a couple eve RW-/RW events. .16" MTD.
3/7/2020 7:00 AM 0.10 M M M M R- Mrng then ocnl RW- then R- late eve til just after midnite. 0.26" MTD.
3/13/2020 7:00 AM 0.42 M M M M Overnight R-/R. 0.76" MTD.
3/15/2020 7:00 AM 0.17 M M M M Eve/overnight R-. 0.93" MTD.
3/19/2020 7:00 AM 0.46 M M M M R- Late eve/overnight briefly R. 1.39" MTD.
3/21/2020 8:00 AM 0.26 M M M M Ocnl aftn RW-. R- Overnight. 1.65" LWE MTD.
3/23/2020 7:00 AM 0.11 M M M M Ocnl overnight R- briefly R.
3/24/2020 7:00 AM 0.19 M M M M Mrng R-. Ocnl aftn RW-. 0.28" Event total. 1.63" MTD.
3/25/2020 8:00 AM 0.04 M M M M Overnight/early mrng R-. Dry slotted!
3/26/2020 7:00 AM 0.18 M M M M Mrng/aftn R-. 0.22" Event total. 2.15" MTD.
3/28/2020 8:00 AM 0.26 M M M M Overnight TRW then RW- into mrng. 2.41" MTD.
3/29/2020 7:00 AM 0.13 M M M M Mrng RW-. 0.39" Event total. 2.54" MTD.
4/1/2020 7:00 AM 0.11 M M M M Late aftn/eve R-/L-. 2.61" March precip total. Pathetic total of 0.4" S/IP for the entire 2019-20 "winter"!
4/8/2020 7:00 AM 0.20 M M M M Late aftn/late eve/late night into early mrng RW-.
4/9/2020 8:00 AM 0.11 M M M M Early mrng TRW.
4/13/2020 7:00 AM 0.94 M M M M R- Eve into early overnight then TRW+ then R-/R.
4/14/2020 7:00 AM 0.47 M M M M 0.38" Mrng R-/R. .09" Late aftn RW-. 1.41" Event total. 1.72" MTD.
4/15/2020 8:00 AM 0.39 M M M M R- late eve into early mrng. 2.11" MTD.
4/24/2020 8:00 AM 1.61 M M M M R-/R Aftn/eve. Ocnl RW-/R early overnight. R Briefly R+ later overnight tapering off to R- by morning. 3.80" MTD.
4/25/2020 7:00 AM 0.04 M M M M Mrng R-. 1.65" Event total. 3.84" MTD.
4/26/2020 8:00 AM 0.40 M M M M .08" Eve R-. .32" Overnight R. 4.24" MTD.
4/27/2020 7:00 AM 0.18 M M M M .04" Sun. morning RW-. 0.14" Overnight R-. 0.58" Event total. 4.42" MTD.
4/29/2020 7:00 AM 0.03 M M M M Ocnl aftn/eve R-.
5/1/2020 8:00 AM 1.24 M M M M 1.15" R-/R Mrng/aftn. .09" Early mrng RW. 5.60" April precip.
5/2/2020 7:00 AM 0.08 M M M M Mrng R-. 1.32" Event total.
5/4/2020 7:00 AM 0.94 M M M M .15" Mrng R-/R. 0.79" Eve/early overnight TRW.
5/6/2020 7:00 AM 0.18 M M M M Eve R-/R.
5/7/2020 7:00 AM 0.09 M M M M .08" Early aftn RW-. .01" Early overnight RW-. 0.27" Event total. 1.38" MTD.
5/9/2020 7:00 AM 0.19 M M M M Ocnl aftn/eve RW/R-. 1.57" MTD.
5/11/2020 7:00 AM 0.01 M M M M Late night/dawn RW-. 1.58" MTD.
5/28/2020 7:00 AM 0.08 M M M M Late overnight RW-.
5/29/2020 7:00 AM 0.33 M M M M Ocnl mrng/aftn RW-/RW. 0.41" Event total. 3.32" Monthly total.
6/5/2020 7:00 AM 0.25 M M M M .22" Eve TRW+. .03" Overnight RW-.
6/6/2020 7:00 AM 0.52 M M M M Eve TRW+/RW-. 0.77" MTD.
6/12/2020 7:00 AM 0.17 M M M M Ocnl mrng/aftn RW-/RW+. 0.21" Event total.
6/18/2020 7:00 AM 0.65 M M M M Ocnl RW-/TRW/RW aftn/eve. 1.63" MTD.
6/21/2020 7:00 AM 1.28 M M M M Noontime/aftn TRW+. 2.91" MTD.
6/22/2020 7:00 AM 0.56 M M M M Late aftn RW. 3.47" MTD.
6/23/2020 7:00 AM 0.18 M M M M Late day/eve TRW-/RW-. 3.65" MTD.
6/26/2020 7:00 AM 0.12 M M M M T Late aftn TRW-. .12" Early eve TRW.
6/28/2020 7:00 AM 0.13 M M M M Late day TRW. 3.90" MTD.
7/1/2020 7:00 AM 0.23 M M M M 0.13" Late eve RW. 0.10" Pre-dawn TRW. June total precip 4.03" 21.76" YTD.
7/2/2020 7:00 AM 0.17 M M M M Ocnl aftn TRW/TRW-.
7/7/2020 7:00 AM 5.26 M M M M TRW/TRW+ Eve/overnight. Nearly constant thunder w/frequent CTC lightning from 7 p.m. til after 4 a.m!
7/12/2020 7:00 AM 0.22 M M M M Rogue early aftn RW+! 5.75" MTD.
7/14/2020 7:00 AM 0.51 M M M M Late eve TRW+. 6.27" MTD!
7/22/2020 7:00 AM 0.11 M M M M Eve TRW-. Vivid CTC LTNG!
7/23/2020 7:00 AM 0.31 M M M M Late aftn/eve TRW-/TRW. 6.69" MTD.
7/24/2020 7:00 AM 0.18 M M M M Eve TRW-/TRW.
7/25/2020 7:00 AM 0.18 M M M M Early Fri. morning RW. 7.05" MTD!
7/29/2020 7:00 AM 0.04 M M M M Late day/eve TRW-. 7.09" MTD.
7/31/2020 7:00 AM 0.32 M M M M Eve TRW-/TRW morphing into overnight R-/RW-.
8/1/2020 7:00 AM 0.18 M M M M Early aftn RW-. 0.50" Event total. 7.59" July total!
8/3/2020 7:00 AM 0.30 M M M M Overnight TRW-/TRW.
8/4/2020 8:00 AM 3.75 M M M M R- Developing in evening becoming R overnight then R+ by morning. About as heavy as I've ever seen it rain here now!
8/6/2020 7:00 AM 0.09 M M M M Late night TRW-.
8/7/2020 7:00 AM 0.09 M M M M Late day/eve RW-/TRW-. 6.91" MTD.
8/8/2020 7:00 AM 1.57 M M M M TRW+ Late eve into early overnight briefly TRW++! 8.48" MTD!
8/13/2020 6:00 AM 0.02 M M M M Late day TRW-.
8/14/2020 7:00 AM 2.52 M M M M 2.50" Thu. mrng TRW++! .02" Late overnight RW-. 11.02" MTD! 40.37" YTD!
8/15/2020 7:00 AM 0.03 M M M M .03" Aftn RW-. T Overnight R--.
8/16/2020 7:45 AM 1.23 M M M M Overnight R tapering off to R- in mrng. 12.28" MTD!
8/17/2020 7:00 AM 0.05 M M M M Sun. mrng R-.
8/18/2020 7:00 AM 0.06 M M M M Brief early eve RW w/ rainbow!
8/20/2020 7:00 AM 0.22 M M M M R-/R Wed. mrng. 12.66" MTD, just .2" short of my all-time monthly record (May 2008) in almost 40 years of observations!
8/22/2020 9:00 AM 0.04 M M M M RW-/R- Late night/early mrng. 12.70" MTD!
8/26/2020 7:00 AM 0.11 M M M M Eve TRW. 12.77" MTD!
8/29/2020 6:00 AM 2.40 M M M M Eve TRW+ morphing into overnight R/R-.
8/30/2020 7:00 AM 1.66 M M M M Mrng R-/R. Aftn RW+. 4.06" Event total. 16.83" MTD, an all-time monthly record here! COCORAHS needs another "Flood" category! Definitely not a "typical" flood event but not an "every few years" event either!
9/1/2020 7:00 AM 0.38 M M M M 0.29" Aftn/early eve R-/R. .09" Overnight RW. Record 17.12" Aug. precip and 28.74" for summer (JJA), MIA/MSY/IAH would be proud!
9/4/2020 7:00 AM 0.45 M M M M Eve TRW+.
9/18/2020 7:00 AM 0.73 M M M M R-/R Late aftn into early overnight.
9/26/2020 7:00 AM 1.14 M M M M .01" Late artn RW-. R-/R Redeveloping in eve briefly R+ around midnight tapering off to RW- by mrng. 5.05" MTD. 22.12" Since Aug. 1!
9/29/2020 7:00 AM 0.08 M M M M Rogue late aftn RW! 5.19" MTD.
9/30/2020 7:00 AM 0.90 M M M M R-/R Eve/overnight. 6.09" Sept. precip. 23.21" Since Aug. 1!



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes



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