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 17 3.50 2.30 6 2.30 6 0.00 0 0 6 0 0.0 0 0
Nov 17 3.39 2.09 7 2.09 7 0.00 0 0 7 0 0.0 0 0
Dec 17 3.35 0.70 6 0.70 6 0.00 0 0 6 0 3.5 3 1
Jan 18 3.05 0.71 5 0.71 5 0.00 0 0 5 0 3.4 2 2
Feb 18 2.80 6.62 12 6.62 12 0.00 0 0 12 0 0.0 0 0
March 18 3.82 0.82 5 0.82 5 0.00 0 0 5 0 0.4 1 0
April 18 3.32 2.82 8 2.82 8 0.00 0 0 8 0 0.0 0 0
May 18 4.23 10.21 11 10.21 11 0.00 0 0 11 0 0.0 0 0
June 18 3.91 5.59 8 5.59 8 0.00 0 0 8 0 0.0 0 0
July 18 4.00 11.81 8 11.81 8 0.00 0 0 8 0 0.0 0 0
Aug 18 3.49 3.64 9 3.64 9 0.00 0 0 8 0 0.0 0 0
Sept 18 3.83 4.20 8 4.20 8 0.00 0 0 8 0 0.0 0 0
Water Year Totals: 42.69" 51.51" 93 days 51.51" 93 0.00" 0 days 0 92 days 0 days 7.3" 6 days 3 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
10/1/2017
10/2/2017
10/3/2017
10/4/2017
10/5/2017
10/6/2017
10/7/2017
10/8/2017
10/9/2017
10/10/2017
10/11/2017
10/12/2017 0.19
10/13/2017
10/14/2017 0.11
10/15/2017
10/16/2017 0.14
10/17/2017
10/18/2017
10/19/2017
10/20/2017
10/21/2017
10/22/2017
10/23/2017
10/24/2017 0.29
10/25/2017
10/26/2017
10/27/2017
10/28/2017
10/29/2017 0.51
10/30/2017 1.06
10/31/2017
11/1/2017
11/2/2017
11/3/2017
11/4/2017
11/5/2017 0.73
11/6/2017
11/7/2017
11/8/2017 0.93
11/9/2017
11/10/2017 0.04
11/11/2017
11/12/2017
11/13/2017 0.19
11/14/2017
11/15/2017
11/16/2017 0.02
11/17/2017
11/18/2017
11/19/2017 0.11
11/20/2017
11/21/2017
11/22/2017 0.07
11/23/2017
11/24/2017
11/25/2017
11/26/2017
11/27/2017
11/28/2017
11/29/2017
11/30/2017
12/1/2017
12/2/2017
12/3/2017
12/4/2017
12/5/2017
12/6/2017 0.18
12/7/2017
12/8/2017
12/9/2017
12/10/2017 0.25
12/11/2017
12/12/2017
12/13/2017
12/14/2017
12/15/2017
12/16/2017 0.05
12/17/2017
12/18/2017
12/19/2017
12/20/2017
12/21/2017
12/22/2017
12/23/2017
12/24/2017 0.15
12/25/2017 0.04
12/26/2017
12/27/2017
12/28/2017
12/29/2017
12/30/2017 0.03
12/31/2017
Day of YearDaily PrcpMultiday Prcp
1/1/2018
1/2/2018
1/3/2018
1/4/2018 0.21
1/5/2018
1/6/2018
1/7/2018
1/8/2018
1/9/2018 0.11
1/10/2018
1/11/2018
1/12/2018
1/13/2018
1/14/2018
1/15/2018
1/16/2018
1/17/2018 0.05
1/18/2018
1/19/2018
1/20/2018
1/21/2018
1/22/2018
1/23/2018 0.09
1/24/2018
1/25/2018
1/26/2018
1/27/2018
1/28/2018
1/29/2018 0.25
1/30/2018
1/31/2018
2/1/2018
2/2/2018 0.06
2/3/2018
2/4/2018
2/5/2018 1.00
2/6/2018
2/7/2018 0.06
2/8/2018 0.42
2/9/2018
2/10/2018
2/11/2018 2.70
2/12/2018 1.76
2/13/2018 0.07
2/14/2018
2/15/2018 0.10
2/16/2018
2/17/2018
2/18/2018
2/19/2018
2/20/2018 0.01
2/21/2018
2/22/2018
2/23/2018 0.07
2/24/2018
2/25/2018 0.17
2/26/2018 0.20
2/27/2018
2/28/2018
3/1/2018
3/2/2018 0.14
3/3/2018
3/4/2018
3/5/2018
3/6/2018
3/7/2018 0.57
3/8/2018
3/9/2018
3/10/2018
3/11/2018
3/12/2018
3/13/2018 0.03
3/14/2018
3/15/2018
3/16/2018
3/17/2018
3/18/2018
3/19/2018
3/20/2018
3/21/2018
3/22/2018
3/23/2018
3/24/2018
3/25/2018
3/26/2018
3/27/2018
3/28/2018
3/29/2018 0.05
3/30/2018
3/31/2018 0.03
Day of YearDaily PrcpMultiday Prcp
4/1/2018
4/2/2018 0.02
4/3/2018
4/4/2018 0.01
4/5/2018
4/6/2018
4/7/2018
4/8/2018
4/9/2018
4/10/2018
4/11/2018
4/12/2018
4/13/2018
4/14/2018
4/15/2018
4/16/2018 1.40
4/17/2018
4/18/2018
4/19/2018
4/20/2018 0.04
4/21/2018
4/22/2018
4/23/2018
4/24/2018
4/25/2018 0.68
4/26/2018
4/27/2018 0.61
4/28/2018 0.03
4/29/2018 0.03
4/30/2018
5/1/2018
5/2/2018
5/3/2018
5/4/2018
5/5/2018
5/6/2018
5/7/2018
5/8/2018
5/9/2018
5/10/2018
5/11/2018
5/12/2018
5/13/2018 0.97
5/14/2018 0.58
5/15/2018 0.50
5/16/2018 0.77
5/17/2018 0.97
5/18/2018 2.39
5/19/2018 1.33
5/20/2018 0.05
5/21/2018
5/22/2018
5/23/2018 0.92
5/24/2018
5/25/2018
5/26/2018
5/27/2018
5/28/2018 1.70
5/29/2018 0.03
5/30/2018
5/31/2018
6/1/2018 1.51
6/2/2018 0.51
6/3/2018 0.43
6/4/2018 2.07
6/5/2018
6/6/2018
6/7/2018
6/8/2018
6/9/2018
6/10/2018 0.52
6/11/2018
6/12/2018
6/13/2018
6/14/2018
6/15/2018
6/16/2018
6/17/2018
6/18/2018
6/19/2018
6/20/2018 0.34
6/21/2018 0.09
6/22/2018
6/23/2018
6/24/2018
6/25/2018 0.12
6/26/2018
6/27/2018
6/28/2018
6/29/2018
6/30/2018
Day of YearDaily PrcpMultiday Prcp
7/1/2018
7/2/2018
7/3/2018
7/4/2018
7/5/2018
7/6/2018
7/7/2018
7/8/2018
7/9/2018
7/10/2018
7/11/2018
7/12/2018
7/13/2018
7/14/2018
7/15/2018
7/16/2018
7/17/2018
7/18/2018 0.50
7/19/2018
7/20/2018
7/21/2018
7/22/2018 6.17
7/23/2018 3.00
7/24/2018 0.55
7/25/2018 1.15
7/26/2018 0.02
7/27/2018
7/28/2018 0.22
7/29/2018
7/30/2018
7/31/2018 0.20
8/1/2018 0.55
8/2/2018
8/3/2018 0.23
8/4/2018 0.13
8/5/2018
8/6/2018 0.00
8/7/2018
8/8/2018 0.56
8/9/2018
8/10/2018
8/11/2018
8/12/2018 0.08
8/13/2018 0.22
8/14/2018 0.05
8/15/2018
8/16/2018
8/17/2018
8/18/2018
8/19/2018
8/20/2018
8/21/2018
8/22/2018 1.82
8/23/2018
8/24/2018
8/25/2018
8/26/2018
8/27/2018
8/28/2018
8/29/2018
8/30/2018
8/31/2018
9/1/2018
9/2/2018
9/3/2018
9/4/2018
9/5/2018
9/6/2018
9/7/2018
9/8/2018 0.08
9/9/2018 1.40
9/10/2018 0.92
9/11/2018 0.04
9/12/2018
9/13/2018
9/14/2018
9/15/2018
9/16/2018
9/17/2018
9/18/2018 0.09
9/19/2018 0.27
9/20/2018
9/21/2018
9/22/2018
9/23/2018
9/24/2018
9/25/2018
9/26/2018
9/27/2018 0.51
9/28/2018 0.89
9/29/2018
9/30/2018



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/12/2017 7:00 AM 0.19 M M M M Late day/eve L-. Early overnight R-. 0.64" MTD.
10/14/2017 7:00 AM 0.11 M M M M Ocnl L-/R- heaviest in eve. 0.30" Event total. 0.75" MTD.
10/16/2017 8:00 AM 0.14 M M M M RW- Early overnight. R-/Briefly R later overnight.
10/24/2017 7:00 AM 0.29 M M M M Ocnl overnight RW-/RW. 1.18" MTD.
10/29/2017 9:00 AM 0.51 M M M M R-/R late overnight into early mrng.
10/30/2017 7:00 AM 1.06 M M M M Mrng L-. R-/R aftn 0cnly R+ in eve tapering off to ocnl R- overnight. 1.57" Event total. 2.75" MTD.
11/5/2017 7:00 AM 0.73 M M M M R-/R eve tapering off to L- overnight. Unexpectedly heavy event!
11/8/2017 7:00 AM 0.93 M M M M R-/R Late mrng thru eve. 1.66" MTD.
11/10/2017 7:00 AM 0.04 M M M M Rw- Mrng and eve. 1.70" MTD.
11/13/2017 7:00 AM 0.19 M M M M Overnight R-. 1.89" MTD.
11/16/2017 7:00 AM 0.02 M M M M Overnight RW-. 1.91" MTD.
11/19/2017 7:00 AM 0.11 M M M M R- Overnight. 2.03" MTD.
11/22/2017 7:00 AM 0.07 M M M M Overnight R-. 2.09" MTD.
12/6/2017 7:00 AM 0.18 M M M M Steady eve R-. Brief overnight RW-. 0.23" MTD.
12/10/2017 7:00 AM 0.25 3.0 M 3.0 M R-/S-/SG- Mrng then S- aftn briefly S/S+ before ending in eve.
12/16/2017 7:00 AM 0.05 0.2 M 0.0 M Aftn SG-. 0.53" LWE MTD.
12/24/2017 7:00 AM 0.15 M M M M Ocnl aftn RW- w/ brief late day RW. 0.16" Event total. 0.69" MTD.
12/25/2017 7:00 AM 0.04 M M M M Eve R-. 0.73" MTD. Merry Christmas to COCORAHS all!
12/30/2017 7:00 AM 0.03 0.3 M M M S- Overnight. 0.76" LWE for Dec. 3.5" S/SG for Dec. 40.17" 2017 Calendar year total precip.
1/4/2018 7:00 AM 0.21 3.0 M 3.0 M S- Late eve into morning.
1/9/2018 7:00 AM 0.11 M M M M Late aftn/early eve R-. 0.32" MTD. Mrng fog.
1/17/2018 7:00 AM 0.05 0.4 M 0.5 M Overnight S- into mrng. 0.96" LWE MTD. 6.9" Seasonal snowfall thus far.
1/23/2018 8:00 AM 0.09 M M M M Late night/early morning R-.
1/29/2018 7:00 AM 0.25 M M M M R- Mrng til eve. 0.42" Event total. 1.47" LWE MTD.
2/2/2018 7:00 AM 0.06 0.0 M M M R- Overnight. Yet another pathetic underperforming system. Only 7.09" in the past 5 months! Bigly drought!
2/5/2018 7:00 AM 1.00 M M M M R- Late mrng/early aftn intensifying to R/R+ late aftn then tapering off to R- then ending early eve. Best drenching in a long time...much needed rain! No ice!
2/7/2018 8:00 AM 0.06 M M M M Late night ZR- into early mrng.
2/8/2018 7:00 AM 0.42 M M M M R-/R Mrng thru late aftn. 0.48" Event total. 1.54"LWE MTD.
2/11/2018 9:30 AM 2.70 M M M M R/R+ Early aftn then mostly R- w/ ocnl R. Ocnl RW+ early mrng. 4.24" MTD thus far. 5 Month long drought over...for now!
2/12/2018 7:00 AM 1.76 M M M M Mrng TRW+ tapering off and ending early aftn. 4.46" Event total thus far is heaviest I've ever measured (records since 1980)in the cool season!
2/13/2018 7:00 AM 0.07 M M M M Ocnl mrng RW-. 4.53" Event total. 6.07" MTD.
2/15/2018 7:00 AM 0.10 M M M M Overnight R-. 6.17" MTD.
2/20/2018 7:00 AM 0.01 M M M M Ocnl mrng/early aftn L-. 6.98" LWE MTD.
2/23/2018 7:00 AM 0.07 M M M M Ocnl RW-/R-/L-. 7.05" MTD.
2/25/2018 7:00 AM 0.17 M M M M Sporadic RW-/L- then R-/R eve. 0.24" Event total thus far. 7.22" LWE MTD.
2/26/2018 7:00 AM 0.20 0.0 M M M 0.20" Mrng R-/R. 0.44" Event total. 7.42" LWE MTD.
3/2/2018 7:00 AM 0.14 M M M M .04" Mrng R-. .10" Eve. R-/R.
3/7/2018 7:00 AM 0.57 0.4 M 0.0 M Ocnl aftn RW-/IPW-. Early eve R/IP turning to S late eve then R-/S- overnight.
3/13/2018 7:00 AM 0.03 M M M M Ocnl R- aftn/early eve turning to S- later in eve.
3/29/2018 7:00 AM 0.05 M M M M R-/L- Late day into eve. Mar. 20-21 rain/snow event: 6.7" Total snow, 1.49" Total LWE.
3/31/2018 7:00 AM 0.03 M M M M Aftn RW-. 2.33" March LWE. 7.1" March total snowfall. 14.4" Seasonal snowfall.
4/2/2018 8:00 AM 0.02 M M M M Late night R-.
4/4/2018 7:00 AM 0.01 M M M M Ocnl aftn R-/L-.
4/16/2018 7:00 AM 1.40 M M M M 0.13" R-/L-/RW- mrng thru eve. 1.27" TRW+/R overnight. Much needed rain ended spell of only 0.11" last 3 1/2 weeks!
4/20/2018 7:00 AM 0.04 M M M M Noontime RW-. 1.47" MTD.
4/25/2018 7:00 AM 0.68 M M M M R--/R- Late aftn intensifying to R-/R eve thru overnight. 2.15" MTD.
4/27/2018 7:00 AM 0.61 M M M M TRW Overnight tapering off to L- by morning.
4/28/2018 7:00 AM 0.03 M M M M Mrng RW-. Event total 0.64". 2.79" MTD.
4/29/2018 7:00 AM 0.03 M M M M Ocnl eve/early overnight RW-. 2.82" April precip. 14.05" LWE YTD.
5/13/2018 7:00 AM 0.97 M M M M 0.65" Eve TRW+A. 1/4" Hail. 0.32" Late night TRW+. First measurable rain in May!
5/14/2018 7:00 AM 0.58 M M M M 0.08" R-/L- Mrng into early aftn. 0.50" Late eve TRW+.
5/15/2018 7:00 AM 0.50 M M M M Eve TRW+. 2.05" MTD.
5/16/2018 7:00 AM 0.77 M M M M Eve TRW+. Late night RW-. 2.82" MTD.
5/17/2018 7:00 AM 0.97 M M M M Ocnl R- mrng intensifying to R-/R later aftn before tapering off in eve. 3.79" MTD.
5/18/2018 8:00 AM 2.39 M M M M Generally R- except for R/R+ late aftn and steady R later at night into morning.
5/19/2018 7:00 AM 1.33 M M M M Mrng R/R+ tapering off to R-/L- then steady R- eve and overnight. 7.51" Since last Sat. eve!
5/20/2018 7:00 AM 0.05 M M M M R-/L- Sat. morning and early aftn. 7.56" MTD!
5/23/2018 7:00 AM 0.92 M M M M Late day TRW+. Otherwise just ocnl RW-. 8.48" MTD!
5/28/2018 7:00 AM 1.70 M M M M Early eve TRW++! L- Overnight intensifying to R- by mrng. 10.18" MTD! Lots of close lightning strikes!
5/29/2018 7:00 AM 0.03 M M M M Mrng R-. Brief late aftn RW-. 10.21" MTD.
6/1/2018 7:00 AM 1.51 M M M M Eve TRW+/RW-. 11.72" May precip total!
6/2/2018 7:00 AM 0.51 M M M M Overnight RW+.
6/3/2018 7:00 AM 0.43 M M M M Aftn TRW. 0.94" MTD.
6/4/2018 7:00 AM 2.07 M M M M R-/R/R+ Mrng thru eve. 3.01" MTD. 14.73" Since May 12!
6/10/2018 6:00 AM 0.52 M M M M 3 Rounds of aftn/eve TRW+/RW-. 3.53" MTD. 15.25" in last 30 days!
6/20/2018 7:00 AM 0.34 M M M M A couple rounds of aftn TRW+. 4.02" MTD.
6/21/2018 7:00 AM 0.09 M M M M Late day/eve RW-. 4.11" MTD.
6/25/2018 7:00 AM 0.12 M M M M Late eve TRW+. 4.72" MTD.
7/18/2018 7:00 AM 0.50 M M M M Aftn RW-/TRW. Nice steady moderate rain. First rain in 20 days!
7/22/2018 7:00 AM 6.17 M M M M R/R+ Starting in early mrng w/ eve TRW+.
7/23/2018 7:00 AM 3.00 M M M M Rounds of aftn TRW's. 9.17" Event total!
7/24/2018 8:00 AM 0.55 M M M M .08" Ocnl RW- then R-/R developing late overnight into early mrng. 9.72" Event total thus far!
7/25/2018 7:00 AM 1.15 M M M M Mrng R/R+. RW- Aftn. 10.87" Event total. Wes (16"+), you're the champ!
7/26/2018 7:00 AM 0.02 M M M M Ocnl RW-. 10.89" Event total, most ever in my nearly 40 years of observations!
7/28/2018 7:00 AM 0.22 M M M M Brief aftn TRW+. 11.61" MTD.
7/31/2018 7:00 AM 0.20 M M M M Periods of R- mrng and late day. R-/L- Overnight. 11.89" MTD.
8/1/2018 7:00 AM 0.55 M M M M Eve R-. TRW+ Early overnight. 11.87" July precip total!
8/3/2018 7:00 AM 0.23 M M M M Late day TRW. Eve RW-. 0.66" MTD.
8/4/2018 7:00 AM 0.13 M M M M Ocnl aftn RW-/RW. 0.79" MTD.
8/6/2018 7:00 AM 0.00 0.0 M M M Startled @3 a.m. to hear a loud clap of thunder, which repeated sporadically for over an hour! Radar revealed a tiny rogue cell in NW Calvert County, apparently the only one in the entire Mid Atlantic at the time. Such nocturnal T-storms occur infrequently in the summertime in our area associated with warm frontal passages but there was no apparent such mechanism, very strange!
8/8/2018 7:00 AM 0.56 M M M M Late day TRW+. 1.35" MTD.
8/12/2018 7:00 AM 0.08 0.0 M M M Late day TRW-. 1.43" MTD.
8/13/2018 7:00 AM 0.22 0.0 M M M Late day/early eve TRW-. 1.65" MTD.
8/14/2018 7:00 AM 0.05 M M M M Late day TRW. 1.70" MTD.
8/22/2018 7:00 AM 1.82 M M M M Ocnl RW-/TRW+ Late mrng into early overnight. 3.52" MTD.
9/8/2018 7:00 AM 0.08 M M M M .07" Late aftn TRW. Only .01" Late eve TRW-.
9/9/2018 9:00 AM 1.40 M M M M R-/L- w/ brief periods of RW+ embedded.
9/10/2018 7:00 AM 0.92 M M M M Mrng/aftn R/R-. 2.40" Event total. 2.55" MTD.
9/11/2018 7:00 AM 0.04 M M M M Ocnl L-. Late eve TRW-.
9/18/2018 7:00 AM 0.09 0.0 M M M Aftn RW-.
9/19/2018 7:00 AM 0.27 M M M M Aftn TRW+. 2.95" MTD.
9/27/2018 7:00 AM 0.51 M M M M Early eve TRW+. 7.21" MTD. Over 53" YTD!
9/28/2018 7:00 AM 0.89 M M M M .13" R-/L- Late day into eve. .76" RW+/R+ overnight. 1.40" Event total. 8.10" MTD.



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