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Viewing Station:
MD-SM-22 : Great Mills 4.0 S
Sep 19, 2017 - Jun 17, 2025
1,566 Total Observations
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Climatology
Precip Summary
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Station Overview
Climatology
Precip Summary
Year-Over-Year
Precip Calendar
Precip Distribution
Obs Calendar
Obs Tables
Observation Data Tables
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Daily Precip
153
Multi-day Precip
1
Significant Weather
0
Hail
0
Condition Monitoring
0
Map
Obs Date
Obs Time
Gauge Catch (in)
Snowfall (in)
Snowpack (in)
Flooding
Notes
Depth
SWE
Depth
SWE
2025-06-17
7:00 AM
0.07
NA
NA
NA
NA
2025-06-16
7:00 AM
0.07
NA
NA
NA
NA
2025-06-15
7:00 AM
0.06
NA
NA
NA
NA
2025-06-14
7:00 AM
0.27
NA
NA
NA
NA
2025-06-13
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-12
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-11
7:00 AM
0.10
NA
NA
NA
NA
2025-06-10
7:30 AM
0.03
NA
NA
NA
NA
2025-06-09
7:00 AM
0.32
NA
NA
NA
NA
2025-06-08
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-07
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-06
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-05
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-04
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-03
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-02
7:00 AM
0.00
0.0
NA
NA
NA
2025-06-01
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-31
7:00 AM
0.09
NA
NA
NA
NA
2025-05-30
7:00 AM
0.37
NA
NA
NA
NA
2025-05-29
7:00 AM
1.51
NA
NA
NA
NA
2025-05-28
7:00 AM
0.33
NA
NA
NA
NA
2025-05-26
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-25
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-24
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-23
7:00 AM
0.03
NA
NA
NA
NA
2025-05-22
7:00 AM
0.63
NA
NA
NA
NA
2025-05-21
7:15 AM
0.05
NA
NA
NA
NA
2025-05-20
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-19
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-18
7:00 AM
0.06
NA
NA
NA
NA
2025-05-17
7:00 AM
0.18
NA
NA
NA
NA
Brief, but severe thunderstorm
2025-05-16
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-15
7:00 AM
0.03
NA
NA
NA
NA
2025-05-14
7:00 AM
1.43
NA
NA
NA
NA
2025-05-13
7:00 AM
0.49
NA
NA
NA
NA
2025-05-12
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-11
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-10
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-09
7:00 AM
1.62
NA
NA
NA
NA
2025-05-08
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-07
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-04
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-03
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-02
7:00 AM
0.00
0.0
NA
NA
NA
2025-05-01
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-30
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-29
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-28
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-27
7:00 AM
0.02
NA
NA
NA
NA
2025-04-26
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-25
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-24
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-23
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-22
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-21
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-20
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-19
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-18
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-17
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-16
7:00 AM
0.07
NA
NA
NA
NA
2025-04-15
7:05 AM
0.05
NA
NA
NA
NA
2025-04-13
8:00 AM
0.08
NA
NA
NA
NA
2025-04-12
8:00 AM
1.79
NA
NA
NA
NA
2025-04-11
8:00 AM
0.00
0.0
NA
NA
NA
2025-04-10
8:00 AM
0.00
0.0
NA
NA
NA
2025-04-09
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-08
7:00 AM
1.03
NA
NA
NA
NA
2025-04-07
7:30 AM
0.22
NA
NA
NA
NA
2025-04-06
7:30 AM
0.00
0.0
NA
NA
NA
2025-04-05
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-04
8:00 AM
0.00
0.0
NA
NA
NA
2025-04-03
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-02
7:00 AM
0.00
0.0
NA
NA
NA
2025-04-01
7:00 AM
1.13
NA
NA
NA
NA
2025-03-31
8:00 AM
0.00
0.0
NA
NA
NA
2025-03-30
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-29
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-28
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-27
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-26
7:00 AM
0.02
NA
NA
NA
NA
2025-03-25
7:00 AM
0.40
NA
NA
NA
NA
2025-03-24
7:00 AM
T
NA
NA
NA
NA
2025-03-23
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-21
7:00 AM
0.85
NA
NA
NA
NA
2025-03-20
8:00 AM
0.00
0.0
NA
NA
NA
2025-03-19
8:00 AM
0.00
0.0
NA
NA
NA
2025-03-18
7:00 AM
0.02
NA
NA
NA
NA
2025-03-17
7:00 AM
0.75
NA
NA
NA
NA
2025-03-16
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-15
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-14
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-13
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-12
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-11
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-10
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-09
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-08
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-07
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-06
7:00 AM
2.22
NA
NA
NA
NA
2025-03-05
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-04
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-03
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-02
7:00 AM
0.00
0.0
NA
NA
NA
2025-03-01
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-28
7:00 AM
T
NA
NA
NA
NA
2025-02-27
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-26
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-25
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-24
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-23
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-22
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-21
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-20
7:00 AM
0.13
1.8
0.13
1.8
0.13
2025-02-17
7:00 AM
0.29
NA
NA
NA
NA
2025-02-16
7:00 AM
1.03
NA
NA
NA
NA
2025-02-14
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-13
7:00 AM
0.64
NA
NA
NA
NA
2025-02-12
7:00 AM
0.99
5.2
0.99
5.2
0.99
2025-02-11
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-10
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-09
7:00 AM
0.24
NA
NA
NA
NA
2025-02-08
7:00 AM
0.02
NA
NA
NA
NA
2025-02-07
7:15 AM
0.38
NA
NA
NA
NA
2025-02-06
7:15 AM
0.82
NA
NA
NA
NA
2025-02-05
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-04
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-03
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-02
7:00 AM
0.00
0.0
NA
NA
NA
2025-02-01
7:00 AM
0.80
NA
NA
NA
NA
2025-01-31
8:00 AM
0.28
NA
NA
NA
NA
2025-01-26
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-25
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-24
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-23
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-22
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-21
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-20
7:00 AM
0.22
NA
NA
NA
NA
2025-01-19
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-18
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-17
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-16
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-15
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-14
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-13
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-12
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-11
8:00 AM
0.10
1.0
0.10
2.6
1.03
2025-01-09
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-06
7:00 AM
0.52
4.2
0.52
NA
NA
2025-01-05
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-04
7:00 AM
0.04
NA
NA
NA
NA
2025-01-03
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-02
7:00 AM
0.00
0.0
NA
NA
NA
2025-01-01
7:00 AM
0.58
NA
NA
NA
NA