Extreme rain in United States, 6 to 18 March 2021

Name: Extreme rain in United States, 6 to 18 March 2021
Start: 2021-03-06
End: 2021-03-18
Location: United States

Extreme rain in United States, 6 to 18 March 2021: 101 records at 51 stations, peak on 11 March 2021. Closed.

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

Key Facts

Extreme rain in United States, 6 to 18 March 2021 set or tied 101 station records at 51 stations.
It ran from 6 March 2021 to 18 March 2021 (13 days) and its peak day was 11 March 2021.
Status: closed.
Ulupalakua Rch 250 set a monthly record daily precipitation of 169.7 mm (6.7 in) on 13 March 2021.
The busiest day was 11 March 2021 with 25 records.
The oldest broken record in the ranked list had stood for 103 years.

Footprint

6 to 18 March 2021

The area covered by Extreme rain in United States, 6 to 18 March 2021 is outlined, with 17 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 6 to 18 March 2021: stations that set records in the event
Station	Type	Value	Date
Ulupalakua Rch 250	Record daily precipitation	169.7 mm (6.7 in)	2021-03-13
Koloa Mauka 994	Record daily precipitation	182.9 mm (7.2 in)	2021-03-08
Kahului AP	Record daily precipitation	105.2 mm (4.1 in)	2021-03-13
Halenanaho 1006	Record daily precipitation	236.2 mm (9.3 in)	2021-03-12
Moloaa 1145	Record daily precipitation	226.1 mm (8.9 in)	2021-03-11
Princeville Rch 1117	Record daily precipitation	204.5 mm (8.1 in)	2021-03-10
Kapalama 773	Record daily precipitation	55.4 mm (2.2 in)	2021-03-11
Kaneohe Bay MCAS	Record daily precipitation	172.0 mm (6.8 in)	2021-03-09
Makaweli 965	Record daily precipitation	48.0 mm (1.9 in)	2021-03-11
Waialae-Kahala 715	Record daily precipitation	121.9 mm (4.8 in)	2021-03-11
Waimea Valley 892.2	Record daily precipitation	90.4 mm (3.6 in)	2021-03-10
Waimanalo Exp F 795.1	Record daily precipitation	119.9 mm (4.7 in)	2021-03-11
Moanalua 770	Record daily precipitation	62.5 mm (2.5 in)	2021-03-09
Waiahole 837	Record daily precipitation	259.1 mm (10.2 in)	2021-03-10
Waihee 837.5	Record daily precipitation	233.9 mm (9.2 in)	2021-03-10
Lanai AP 656	Record daily precipitation	60.5 mm (2.4 in)	2021-03-15
Nuuanu Rsch 5 775	Record daily precipitation	59.9 mm (2.4 in)	2021-03-18

Records per Day

Peak day 25

Records set or tied each day from 6 March 2021 to 18 March 2021. The most in one day was 25 on 11 March 2021.

Records per day during Extreme rain in United States, 6 to 18 March 2021
Date	Records
2021-03-06	1
2021-03-07	2
2021-03-08	10
2021-03-09	14
2021-03-10	11
2021-03-11	25
2021-03-12	7
2021-03-13	8
2021-03-14	4
2021-03-15	7
2021-03-16	3
2021-03-17	4
2021-03-18	5

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 6 to 18 March 2021 ranked by margin
Halenanaho 1006, 03-12	168.9 mm (6.6 in)
Koloa Mauka 994, 03-08	150.9 mm (5.9 in)
Kaneohe Bay MCAS, 03-09	131.4 mm (5.2 in)
Princeville Rch 1117, 03-10	104.9 mm (4.1 in)
Waialae-Kahala 715, 03-11	100.1 mm (3.9 in)
Waimanalo Exp F 795.1, 03-11	94.0 mm (3.7 in)
Kahului AP, 03-13	83.6 mm (3.3 in)
Ulupalakua Rch 250, 03-13	77.0 mm (3.0 in)
Halenanaho 1006, 03-08	76.2 mm (3.0 in)
Waimea Valley 892.2, 03-10	69.1 mm (2.7 in)
Waihee 837.5, 03-10	61.7 mm (2.4 in)
Waiahole 837, 03-10	52.1 mm (2.1 in)
Princeville Rch 1117, 03-07	50.0 mm (2.0 in)
Moloaa 1145, 03-11	41.9 mm (1.6 in)
Nuuanu Rsch 5 775, 03-18	39.3 mm (1.5 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

101 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 Extreme rain in United States, 6 to 18 March 2021
Margin (mm)	Years the old record stood
77	53
151	79
84	56
169	47
42	81
31	79
105	15
131	10
76	19
16	103
100	8
94	8
69	14
50	54
39	67
18	78
52	79
62	15
39	51
31	60
24	70
34	54
3	99
0	103
45	14
28	52
23	39
10	70
8	79
38	32
47	15
38	31
34	15
19	39
17	47
27	31
8	40
7	59
19	39
19	47
22	40
21	47
23	16
8	56
16	40
4	60
18	15
40	19
3	52
20	30
14	30
3	31
0	47
0	59
28	7
5	30
15	43
12	6
19	24
21	16
19	8
12	8
6	0
7	31
13	16
23	19
16	16
3	32
2	31
14	19
21	4
11	16
14	6
8	24
3	24
7	8
14	8
11	7
2	32
11	12
7	15
4	19
3	8
7	8
0	15
6	12
4	20
5	16
2	15
0	15
2	24
1	16
4	16
6	7
3	0
8	8
3	8
1	14
2	15
1	8
2	0

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 6 to 18 March 2021 compared with similar events
Extreme rain in United States and Mexico, 23 February to 15 March 2019	2,223 records
Extreme rain in United States, 3 to 19 January 2024	2,133 records
Extreme rain in Australia, 7 to 26 March 2021	2,099 records
Extreme rain in United States and Mexico, 29 September to 19 October 2018	1,970 records
Extreme rain in United States, 19 December 2022 to 13 January 2023	1,941 records
Extreme rain in United States, 6 to 18 March 2021 (this event)	101 records

Every Record Set

20 of 101

Every record set or tied during Extreme rain in United States, 6 to 18 March 2021, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2021-03-07	Princeville Rch 1117	Record daily precipitation	80.0 mm (3.1 in)	50.0 mm (2.0 in)	54	46 of 100 (Notable)
2021-03-08	Koloa Mauka 994	Record daily precipitation	182.9 mm (7.2 in)	150.9 mm (5.9 in)	79	71 of 100 (Major)
2021-03-08	Halenanaho 1006	Record daily precipitation	133.4 mm (5.3 in)	76.2 mm (3.0 in)	19	49 of 100 (Notable)
2021-03-09	Kaneohe Bay MCAS	Record daily precipitation	172.0 mm (6.8 in)	131.4 mm (5.2 in)	10	51 of 100 (Notable)
2021-03-09	Moanalua 770	Record daily precipitation	62.5 mm (2.5 in)	17.5 mm (0.7 in)	78	45 of 100 (Notable)
2021-03-10	Princeville Rch 1117	Record daily precipitation	204.5 mm (8.1 in)	104.9 mm (4.1 in)	15	52 of 100 (Notable)
2021-03-10	Waimea Valley 892.2	Record daily precipitation	90.4 mm (3.6 in)	69.1 mm (2.7 in)	14	47 of 100 (Notable)
2021-03-10	Waiahole 837	Record daily precipitation	259.1 mm (10.2 in)	52.1 mm (2.1 in)	79	45 of 100 (Notable)
2021-03-10	Waihee 837.5	Record daily precipitation	233.9 mm (9.2 in)	61.7 mm (2.4 in)	15	45 of 100 (Notable)
2021-03-11	Moloaa 1145	Record daily precipitation	226.1 mm (8.9 in)	41.9 mm (1.6 in)	81	62 of 100 (Major)
2021-03-11	Kapalama 773	Record daily precipitation	55.4 mm (2.2 in)	31.3 mm (1.2 in)	79	52 of 100 (Notable)
2021-03-11	Makaweli 965	Record daily precipitation	48.0 mm (1.9 in)	16.0 mm (0.6 in)	103	48 of 100 (Notable)
2021-03-11	Waialae-Kahala 715	Record daily precipitation	121.9 mm (4.8 in)	100.1 mm (3.9 in)	8	48 of 100 (Notable)
2021-03-11	Waimanalo Exp F 795.1	Record daily precipitation	119.9 mm (4.7 in)	94.0 mm (3.7 in)	8	47 of 100 (Notable)
2021-03-11	Nuuanu Rsch 5 775	Record daily precipitation	52.1 mm (2.1 in)	30.8 mm (1.2 in)	60	43 of 100 (Notable)
2021-03-12	Halenanaho 1006	Record daily precipitation	236.2 mm (9.3 in)	168.9 mm (6.6 in)	47	62 of 100 (Major)
2021-03-13	Ulupalakua Rch 250	Record daily precipitation	169.7 mm (6.7 in)	77.0 mm (3.0 in)	53	72 of 100 (Major)
2021-03-13	Kahului AP	Record daily precipitation	105.2 mm (4.1 in)	83.6 mm (3.3 in)	56	66 of 100 (Major)
2021-03-15	Lanai AP 656	Record daily precipitation	60.5 mm (2.4 in)	38.7 mm (1.5 in)	67	45 of 100 (Notable)
2021-03-18	Nuuanu Rsch 5 775	Record daily precipitation	59.9 mm (2.4 in)	39.3 mm (1.5 in)	51	44 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 101 records the event counts. The counts above use the full total.

Related Headlines

Third party news, headline and link only

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.

Margin (mm)	Years the old record stood
77	53
151	79
84	56
169	47
42	81
31	79
105	15
131	10
76	19
16	103
100	8
94	8
69	14
50	54
39	67
18	78
52	79
62	15
39	51
31	60
24	70
34	54
3	99
0	103
45	14
28	52
23	39
10	70
8	79
38	32
47	15
38	31
34	15
19	39
17	47
27	31
8	40
7	59
19	39
19	47
22	40
21	47
23	16
8	56
16	40
4	60
18	15
40	19
3	52
20	30
14	30
3	31
0	47
0	59
28	7
5	30
15	43
12	6
19	24
21	16
19	8
12	8
6	0
7	31
13	16
23	19
16	16
3	32
2	31
14	19
21	4
11	16
14	6
8	24
3	24
7	8
14	8
11	7
2	32
11	12
7	15
4	19
3	8
7	8
0	15
6	12
4	20
5	16
2	15
0	15
2	24
1	16
4	16
6	7
3	0
8	8
3	8
1	14
2	15
1	8
2	0

Margin (mm)	Years the old record stood
77	53
151	79
84	56
169	47
42	81
31	79
105	15
131	10
76	19
16	103
100	8
94	8
69	14
50	54
39	67
18	78
52	79
62	15
39	51
31	60
24	70
34	54
3	99
0	103
45	14
28	52
23	39
10	70
8	79
38	32
47	15
38	31
34	15
19	39
17	47
27	31
8	40
7	59
19	39
19	47
22	40
21	47
23	16
8	56
16	40
4	60
18	15
40	19
3	52
20	30
14	30
3	31
0	47
0	59
28	7
5	30
15	43
12	6
19	24
21	16
19	8
12	8
6	0
7	31
13	16
23	19
16	16
3	32
2	31
14	19
21	4
11	16
14	6
8	24
3	24
7	8
14	8
11	7
2	32
11	12
7	15
4	19
3	8
7	8
0	15
6	12
4	20
5	16
2	15
0	15
2	24
1	16
4	16
6	7
3	0
8	8
3	8
1	14
2	15
1	8
2	0

Margin (mm)	Years the old record stood
77	53
151	79
84	56
169	47
42	81
31	79
105	15
131	10
76	19
16	103
100	8
94	8
69	14
50	54
39	67
18	78
52	79
62	15
39	51
31	60
24	70
34	54
3	99
0	103
45	14
28	52
23	39
10	70
8	79
38	32
47	15
38	31
34	15
19	39
17	47
27	31
8	40
7	59
19	39
19	47
22	40
21	47
23	16
8	56
16	40
4	60
18	15
40	19
3	52
20	30
14	30
3	31
0	47
0	59
28	7
5	30
15	43
12	6
19	24
21	16
19	8
12	8
6	0
7	31
13	16
23	19
16	16
3	32
2	31
14	19
21	4
11	16
14	6
8	24
3	24
7	8
14	8
11	7
2	32
11	12
7	15
4	19
3	8
7	8
0	15
6	12
4	20
5	16
2	15
0	15
2	24
1	16
4	16
6	7
3	0
8	8
3	8
1	14
2	15
1	8
2	0