Tracking Severe Thunderstorms and Excessive Rainfall in the Southern U.S.; Winter Storm to Impact the Northern U.S.

A storm system will shift from eastern Texas into the lower Mississippi Valley Monday with additional threats of severe thunderstorms and heavy to excessive rainfall which may bring flooding. A Flood Watch remains in effect. In the northern U.S., a storm will bring heavy snow and gusty winds over parts of the northern Rockies, northern Plains, and Upper Midwest Monday into Wednesday. Read More >

...Highlights of 2020...

Annual: 1st driest year on 81 years of record (1939-2020), with just 46.2 percent of normal precipitation, 20th snowiest year on record with 119 percent of normal annual snowfall. Highest wind gust was 75 mph on January 4th.
Monthly Temperatures: 10th coldest October on record.
Monthly Precipitation: 1st driest May (tie), 1st driest July, 4th driest August and 1st driest November (tie) on record.
Monthly Snowfall: 1st snowiest February and 4th snowiest September on record.

Temperatures

Winds

Precipitation

Snowfall

Temperature Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Average High	37.1	30.4	47.4	54.7	69.8	82.1	94.2	90.9	75.5	59.3	51.7	35.7	60.5
Mean High (1981-2010 Normals)	35.2	37.8	47.9	56.8	67.1	78.8	88.1	86.4	74.3	59.4	44.7	34.2	59.2
Average Low	18.1	12.6	24.5	23.4	36.3	45.7	52.2	51.9	40	26	22.5	16.8	30.8
Mean Low (1981-2010 Normals)	14.3	15.7	22.4	28.6	37.2	45.7	53.0	51.5	41.4	31.0	21.6	13.5	31.3
Average Temperature	27.6	21.5	36	39	53	63.9	71.7	71.4	57.8	42.6	37.1	26.3	45.7
Mean Average Temperature (1981-2010 Normals)	24.7	26.7	35.2	42.7	52.2	62.2	70.5	69.0	57.9	45.2	33.2	23.8	45.3
Departure from Normal	2.9	-5.2	0.8	-3.7	0.8	1.7	1.2	2.4	-0.1	-2.6	3.9	2.5	0.4
Rank: 81 years of record (P.O.R 12/1939-2020)	63	15	51	13	43	52	52	66	31	10	62	44	43

Highest Daily Maximum	49	44	60	78	91	94	100	98	98	82	73	53	100
Date of Occurrence	16	29	31	30	31	5	12	23	5	6	4	9	7/12
Lowest Daily Minimum	3	-6	6	-5	22	31	41	33	24	-8	4	-9	-9
Date of Occurrence	10	13	1	3	8	18	2	31	9	25	21	28	12/28
Number of Days with:	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Maximum >= 90°	0	0	0	0	1	5	19	25	4	0	0	0	54
Maximum <= 32°	5	18	5	4	0	0	0	0	0	2	1	14	49
Minimum <= 32°	31	28	28	24	10	1	0	0	6	18	23	29	198
Minimum <= 0°	0	2	0	2	0	0	0	0	0	3	0	3	10
Record High Temperatures Set or Tied	0	0	0	0	1	2	0	2	2	1	4	0	11
Record Low Temperatures Set or Tied	0	0	0	3	2	1	0	1	3	5	0	0	15

Temperature Ranks and Records:

Daily Records:

Record High Temperatures:

May: 91 on the 31st.

June: 91 on the 1st and 94 on the 5th.
  August: 97 on the 17th (tie) and 98 on the 23rd.

  September: 98 on the 5th (ties all time high). 87 on the 24th (tie).

  October: 81 on the 8th.
  November: 71 on the 2nd (tie), 72 on the 3rd, 73 on the 4th, and 71 on the 5th (tie).

Record Low Temperatures:

April: -5 on the 3rd, 23 on the 12th, and 7 on the 13th.
May: 29 on the 24th and 27 on the 25th.
June: 31 on the 18th.

August: 33 on the31st (tie).
September: 29 on the 8th (tie), 24 on the 9th, and 27 on the 10th.

October: 9 on the 22nd, -5 on the 23rd, 10 on the 24th, 8 on the 25th and -6 on the 26th.

Coldest Months of October on Record
Rank	Year	Average Temperature °F
1	2019	36.8
2	2009	37.0
3	1969	37.8
4	2002	38.3
5	1984	40.1
6	1949	41.0
7	1970	41.2
8	2013	41.5
9	1946	41.8
10	2020	42.3

Top Ten Warmest Years on Record
Rank	Year	Average Temperature °F
1	1994	49.1
2	2012	48.7
3	1954	48.3
4	1981	48.1
5	1992	48.0
6	1940, 1953, 1963	47.3
9	2015, 2006, 1999	47.1
40	2020	45.7

Top Ten Coldest Years on Record
Rank	Year	Average Temperature °F
1	1985	42.5
2	1951	43.1
3	1978	43.2
4	1964	43.5
5	2019, 1975	43.6
6	2009, 1979, 1968, 1949	43.8
10	1971	43.9
43	2020	45.7


Average Annual Temperature for Period of Record - Click on Graph to Enlarge

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Wind Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Average Speed (MPH)	16.8	15.7	13.8	11.1	11	11.8	10	9	10.4	12.4	16.4	16	12.9
Maximum 3-sec Gust	75	57	62	54	59	70	55	61	53	57	72	53	75
Direction	210	230	260	220	230	220	220	220	250	310	210	210	210
Date of Occurrence	4	14	11	6	31	6	7	24	19	11	8	22	1/4
Number of Days with:
2-Min Wind >50 mph	1	0	1	0	0	0	0	0	0	0	0	0	2
Peak Wind >50 mph	6	3	2	3	4	10	6	5	1	5	9	3	57
Peak Wind >70 mph	1	0	0	0	0	1	0	0	0	0	1	0	3

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Precipitation Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	0.48	0.82	0.96	1.28	0.3	0.3	0.02	0.05	0.54	0.32	0.04	0.68	5.79
Mean Precipitation (1981-2010 Normals)	0.51	0.57	0.82	1.29	2.02	1.61	1.41	0.85	1.08	1.11	0.76	0.49	12.52
Departure from Normal	-0.03	0.25	0.14	-0.01	-1.72	-1.31	-1.39	-0.8	-0.54	-0.79	-0.72	0.19	-6.73
Percent of Normal	94	144	117	99	15	19	1	6	50	29	5	139	46
Rank - 81 years (P.O.R 12/1939-2020)	41	70	50	44	1	11	1	4	35	13	1	56	1

Greatest 24-HR Total	0.16	0.24	0.24	0.42	0.15	0.17	0.02	0.02	0.32	0.13	0.02	0.23	0.42
Dates of Occurrence	29	3	25	23	4	6	29	3, 6	7	22	14	22-23	4/23
Number of Days with:
Precipitation >= 0.01	6	10	8	9	6	5	1	3	3	7	3	10	71
Precipitation >= 0.10	2	4	5	5	1	1	0	0	2	1	0	3	24
Precipitation >= 1.00	0	0	0	0	0	0	0	0	0	0	0	0	0
Days with Thunderstorms	0	0	0	3	2	7	4	10	0	0	0	0	26
Daily Precipitation Records Set or Tied	0	0	0	0	0	0	0	0	0	0	0	1	1

Precipitation Ranks and Records:

One Day Precipitation Records:

December: 0.22" on the 22nd.

Top Ten Driest May's on Record
Rank	Year	Precipitation (inches)
1	2020	0.30
1	1966	0.30
3	1994	0.37
4	2009	0.43
5	2014	0.49
6	2003	0.51
7	1960	0.56
8	1974	0.62
9	2001	0.63
10	1954	0.70

Top Ten Driest July's on Record
Rank	Year	Precipitation (inches)
1	2020	0.02
2	1991	0.09
3	1971	0.11
4	2000	0.22
5	2016	0.24
5	1999	0.24
7	1959	0.27
7	1955	0.27
9	1989	0.28
10	2017	0.37

Top Ten Driest August's on Record
Rank	Year	Precipitation (inches)
1	1944	Trace
2	1950	0.02
3	1995	0.04
4	2020	0.05
5	1961	0.08
6	1943	0.09
6	1985	0.09
8	1951	0.10
9	1971	0.11
9	1999	0.11

Top Ten Driest November's on Record
Rank	Year	Precipitation (inches)
1	1949	0.04
1	2020	0.04
3	2007	0.05
3	2009	0.05
5	1965	0.07
6	1997	0.08
7	1976	0.09
8	1951	0.20
8	2000	0.20
10	2013	0.24

Top Ten Driest Years on Record
Rank	Year	Precipitation (inches)
1	2020	5.79
2	1988	6.56
3	2001	6.76
4	2002	7.05
5	1960	7.34
6	1954	7.70
7	2012	7.88
8	1963	7.90
9	1966	8.14
10	1943	8.91

Top Ten Wettest Years on Record
Rank	Year	Precipitation (inches)
1	1982	20.48
2	1995	18.94
3	1983	18.41
4	1978	17.64
5	1941	16.24
6	1957	16.12
7	1986	15.92
8	1993	15.91
9	2009	15.77
10	2016	15.57
81	2020	5.79


Annual Precipitation for Period of Record - Click on Graph to Enlarge

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Snow Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	7.9	28.4	15.1	15.2	0.001	0.001	0	0	7.5	3.7	0.4	11	89.2
Mean Snowfall (1981-2010 Normals)	9.1	9.8	10.9	11.6	2.9	0.1	0.0	0.0	1.8	7.4	10.3	11.0	74.9
Departure from Normal	-1.2	18.6	4.2	3.6	-2.9	0.1	0.0	0.0	5.7	-3.7	-9.9	0	14.3
Percent of Normal	87	290	139	131	0	1	0	0	417	50	4	100	119
Rank - Least to Most 81 years (P.O.R 12/1939-2020)	30	81	62	58	29	NA	NA	NA	78	31	3	50	63

Greatest 24-HR Total	2.6	15.2	4.1	4.9	T	0.0	0.0	0	5.2	2.3	0..4	3.2	15.2
Dates of Occurrence	27	3	12	1	9	NA	NA	NA		20	25	8	2/3
Number of Days with:
Snowfall >= 1.0 inch	3	3	6	5	0	0	0	0	2	2	0	3	24
Daily Snowfall Records Set or Tied	0	0	0	0	0	0	0	0	1	0	0	0	1
* 50 months of September on record with no snowfall.

Snowfall Ranks and Records:

One Day Snowfall Records (inches):

September: 5.2" on the 8th.

Snowiest Months of February on Record
Rank	Year	Snowfall (inches)
1	2020	28.4
2	1952	23.8
3	1987	22.7
4	1989	21.5
4	1955	21.5
6	2004	18.9
7	2018	18.6
8	1953	18.5
9	1995	16.9
10	1976	16.1

Snowiest Months of October on Record
Rank	Year	Snowfall (inches)
1	2000	11.5
1	1982	11.5
3	1965	8.8
4	2020	7.5
5	1995	7.1
6	1985	7.0
7	1961	6.3
8	1974	5.1
9	1994	4.9
10	2013	4.8

Top Ten Snowiest Years on Record
Rank	Year	Snowfall (inches)
1	1982	137.6
2	1975	124.0
3	1984	121.2
4	1973	118.3
5	1983	114.2
6	1978	112.7
7	2013	107.5
8	1955	103.3
9	1979	103.0
10	1985	101.0
20	2020	89.2



Annual and Seasonal Snowfall for Period of Record - Click on Graph to Enlarge

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Tracking Severe Thunderstorms and Excessive Rainfall in the Southern U.S.; Winter Storm to Impact the Northern U.S.

Casper 2020 Annual Summary

Temperature Ranks and Records:

Precipitation Ranks and Records: