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Built 2026-10-19 (19 October 2026)

Snow event in United States, 9 to 30 March 2021

Snow event in United States, 9 to 30 March 2021: 666 records at 346 stations, peak on 15 March 2021. Closed.

Data as of . Last revised (2026-10-17).

Key Facts

  • Snow event in United States, 9 to 30 March 2021 set or tied 666 station records at 346 stations.
  • It ran from 9 March 2021 to 30 March 2021 (22 days) and its peak day was 15 March 2021.
  • Status: closed.
  • Scottsbluff W B Heilig Fld AP set a daily record snowfall of 27.9 cm (11.0 in) on 14 March 2021.
  • The busiest day was 15 March 2021 with 134 records.
  • The oldest broken record in the ranked list had stood for 126 years.

Footprint

9 to 30 March 2021
Footprint of Snow event in United States, 9 to 30 March 2021 The area covered by Snow event in United States, 9 to 30 March 2021 is outlined, with 15 of the stations that set records marked, coloured by record type.
The area covered by Snow event in United States, 9 to 30 March 2021 is outlined, with 15 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Snow event in United States, 9 to 30 March 2021: stations that set records in the event
StationTypeValueDate
Scottsbluff W B Heilig Fld APRecord daily snowfall27.9 cm (11.0 in)2021-03-14
Longmont 2 ESERecord snow depth38.1 cm (15.0 in)2021-03-16
Black RockRecord snow depth30.5 cm (12.0 in)2021-03-12
Casper-Natrona Co APRecord daily snowfall53.8 cm (21.2 in)2021-03-14
Cottonwood 2 ERecord daily snowfall20.3 cm (8.0 in)2021-03-15
Brighton 3 SERecord daily snowfall53.6 cm (21.1 in)2021-03-16
Vega 2NWRecord daily snowfall21.6 cm (8.5 in)2021-03-18
Springview 2NWRecord daily snowfall27.9 cm (11.0 in)2021-03-15
Pedernal 9 ERecord daily snowfall11.2 cm (4.4 in)2021-03-25
Interior 3 NERecord daily snowfall25.4 cm (10.0 in)2021-03-15
BoulderRecord daily snowfall44.5 cm (17.5 in)2021-03-14
Sybille Rsch UnitRecord daily snowfall71.1 cm (28.0 in)2021-03-15
PostvilleRecord daily snowfall16.5 cm (6.5 in)2021-03-16
Charles CityRecord daily snowfall20.3 cm (8.0 in)2021-03-16
KasslerRecord snow depth35.6 cm (14.0 in)2021-03-15

Records per Day

Peak day 134
Records per day during Snow event in United States, 9 to 30 March 2021 Records set or tied each day from 9 March 2021 to 30 March 2021. The most in one day was 134 on 15 March 2021. 0 38 75 113 150 03-0903-1203-1503-1803-2103-2403-27
Records set or tied each day from 9 March 2021 to 30 March 2021. The most in one day was 134 on 15 March 2021.
Records per day during Snow event in United States, 9 to 30 March 2021
DateRecords
2021-03-093
2021-03-1041
2021-03-1138
2021-03-1214
2021-03-1337
2021-03-1484
2021-03-15134
2021-03-1698
2021-03-1746
2021-03-1826
2021-03-191
2021-03-2011
2021-03-2114
2021-03-2224
2021-03-2312
2021-03-2446
2021-03-2516
2021-03-2616
2021-03-272
2021-03-281
2021-03-302

Top Records by Margin

Margin over the record replaced
Top records of Snow event in United States, 9 to 30 March 2021 ranked by margin
Longmont 2 ESE, 03-1625.4 cm (10.0 in)
Sybille Rsch Unit, 03-1525.4 cm (10.0 in)
Black Rock, 03-1222.9 cm (9.0 in)
Interior 3 NE, 03-1522.9 cm (9.0 in)
Springview 2NW, 03-1522.8 cm (9.0 in)
Brighton 3 SE, 03-1620.6 cm (8.1 in)
Boulder, 03-1420.3 cm (8.0 in)
Vega 2NW, 03-1819.1 cm (7.5 in)
Boulder, 03-1419.1 cm (7.5 in)
Scottsbluff W B Heilig Fld AP, 03-1417.7 cm (7.0 in)
Casper-Natrona Co AP, 03-1416.7 cm (6.6 in)
Charles City, 03-1616.5 cm (6.5 in)
Casper-Natrona Co AP, 03-1515.5 cm (6.1 in)
Kassler, 03-1515.3 cm (6.0 in)
Cottonwood 2 E, 03-1515.2 cm (6.0 in)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

Margin against age of the broken record in Snow event in United States, 9 to 30 March 2021 500 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right. 0 38 75 113 150 0125250375500 Margin (mm) Years the old record stood
500 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right.
Margin against age of the broken record in Snow event in United States, 9 to 30 March 2021
Margin (mm)Years the old record stood
177121
25492
152104
229114
16766
20617
19187
15566
102109
22860
11291
22960
19198
10290
20398
114104
25431
16560
128121
15396
76108
102108
20376
123108
15279
35331
23660
38148
11092
15560
8972
101103
12792
10270
15268
11271
38324
89124
7441
26646
38138
12762
15279
30452
10292
9195
12784
15376
15276
11480
83104
16556
26531
152104
7694
45831
101108
26104
10196
51103
40631
20324
10272
76108
10196
1529
16054
22831
18148
76108
11276
51102
61104
17843
101106
15056
51108
51116
1024
8966
38115
7680
17838
63119
5190
51104
10160
33012
16638
5380
51112
9148
30520
28120
6172
5184
5096
51106
15254
10264
6982
10180
3692
35524
30104
7664
8168
25108
5199
25102
5172
7696
3096
10264
7676
18024
25104
12728
24920
3052
4086
5186
2696
7692
17759
7678
21119
25104
4683
14823
22126
7164
25112
25115
25100
5150
27919
25428
25104
25438
7760
15124
12104
25120
25120
12119
17107
13104
12752
25104
2396
16526
10267
10229
15319
2590
27920
5172
12716
25104
10238
5168
14020
7102
2191
1096
10150
10264
12248
12632
4558
2672
5104
2592
15250
10264
10260
6472
3080
2106
5112
4178
5179
10255
12758
2557
2588
2592
10732
5172
5367
2592
2592
298
8260
10163
1024
2588
8743
5668

Compared With Other Events

Station records per event
Station records in Snow event in United States, 9 to 30 March 2021 compared with similar events
Snow event in United States, 3 to 27 January 20242,190 records
Snow event in United States, 24 November to 22 December 20251,539 records
Snow event in United States, 9 to 29 April 20221,475 records
Snow event in United States, 27 September to 17 October 20181,247 records
Snow event in United States, 26 September to 23 October 20191,194 records
Snow event in United States, 9 to 30 March 2021 (this event)666 records

Every Record Set

20 of 666
Every record set or tied during Snow event in United States, 9 to 30 March 2021, in date order
DateStationRecordValueMarginYears stoodSignificance
2021-03-12Black RockRecord snow depth30.5 cm (12.0 in)22.9 cm (9.0 in)11471 of 100 (Major)
2021-03-14Scottsbluff W B Heilig Fld APRecord daily snowfall27.9 cm (11.0 in)17.7 cm (7.0 in)12179 of 100 (Major)
2021-03-14Casper-Natrona Co APRecord daily snowfall53.8 cm (21.2 in)16.7 cm (6.6 in)6671 of 100 (Major)
2021-03-14BoulderRecord daily snowfall44.5 cm (17.5 in)19.1 cm (7.5 in)9864 of 100 (Major)
2021-03-14BoulderRecord snow depth45.7 cm (18.0 in)20.3 cm (8.0 in)9863 of 100 (Major)
2021-03-15Cottonwood 2 ERecord daily snowfall20.3 cm (8.0 in)15.2 cm (6.0 in)10471 of 100 (Major)
2021-03-15Casper-Natrona Co APRecord snow depth46.0 cm (18.1 in)15.5 cm (6.1 in)6668 of 100 (Major)
2021-03-15Longmont 2 ESERecord snow depth50.8 cm (20.0 in)10.2 cm (4.0 in)10967 of 100 (Major)
2021-03-15Springview 2NWRecord daily snowfall27.9 cm (11.0 in)22.8 cm (9.0 in)6066 of 100 (Major)
2021-03-15Interior 3 NERecord daily snowfall25.4 cm (10.0 in)22.9 cm (9.0 in)6065 of 100 (Major)
2021-03-15Sybille Rsch UnitRecord daily snowfall71.1 cm (28.0 in)25.4 cm (10.0 in)3163 of 100 (Major)
2021-03-15KasslerRecord snow depth35.6 cm (14.0 in)15.3 cm (6.0 in)9661 of 100 (Major)
2021-03-16Longmont 2 ESERecord snow depth38.1 cm (15.0 in)25.4 cm (10.0 in)9277 of 100 (Major)
2021-03-16Brighton 3 SERecord daily snowfall53.6 cm (21.1 in)20.6 cm (8.1 in)1769 of 100 (Major)
2021-03-16PostvilleRecord daily snowfall16.5 cm (6.5 in)11.4 cm (4.5 in)10463 of 100 (Major)
2021-03-16Charles CityRecord daily snowfall20.3 cm (8.0 in)16.5 cm (6.5 in)6062 of 100 (Major)
2021-03-17Scottsbluff W B Heilig Fld APRecord snow depth23.0 cm (9.1 in)12.8 cm (5.0 in)12162 of 100 (Major)
2021-03-18Vega 2NWRecord daily snowfall21.6 cm (8.5 in)19.1 cm (7.5 in)8769 of 100 (Major)
2021-03-25Pedernal 9 ERecord daily snowfall11.2 cm (4.4 in)11.2 cm (4.4 in)9166 of 100 (Major)
2021-03-25Pedernal 9 ERecord snow depth10.2 cm (4.0 in)10.2 cm (4.0 in)9064 of 100 (Major)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 666 records the event counts. The counts above use the full total.

Related Headlines

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Download the Data

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.