Western and Central Wyoming

Weather Forecast Office

Lander 2020 Annual Summary

...Highlights of 2020...

Annual - 22nd warmest year at 45.8 degrees with 129 years of record (1892-2020).
5th Driest year on record with 53% of normal precipitation.
67th Snowiest year on record with 84.1 inches (92 percent of normal).
The peak wind gust for the year was 70 mph which occurred on November 7th.
Monthly Temperature: 3rd warmest August on record at 73.3 degrees (tie).
Monthly Precipitation: 1st Driest May (tie) with 0.06 inches, and 6th driest August with a 0.05.
Monthly Snowfall: 4th least snowiest November (tie) with a trace.

Temperature

Wind

Precipitation

Snowfall

Temperature Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Average High	34.2	30.2	47.2	55.4	70.3	79.2	89.6	89.8	76.1	59.8	49.5	34.5	59.7
Mean High (1981-2010 Normals)	33.1	36.5	47.4	56.4	66.5	77.5	86.8	85.0	72.8	58.5	42.8	31.8	58.0
Average Low	13.4	7.7	23.4	26.9	40.9	49.4	56.2	56.9	44.1	28.8	22.2	12.5	31.9
Mean Low (1981-2010 Normals)	10.2	13.9	23.6	31.3	40.1	48.4	55.6	54.3	44.4	32.7	19.7	9.6	32.1
Average Temperature	23.8	19.0	35.3	41.2	55.6	64.3	72.9	73.3	60.1	44.3	35.8	23.5	45.8
Mean Temp (1981-2010 Normals)	21.7	25.2	35.5	43.9	53.3	63.0	71.2	69.6	58.6	45.6	31.2	20.7	45.0
Departure from Normal	2.1	-6.2	-0.2	-2.7	2.3	1.3	1.7	3.7	1.5	-1.3	4.6	2.8	0.8
Rank: Coldest to Warmest 129 years of record (P.O.R 1892-2020)	99	27	80	41	110	98	108	126	94	46	103	81	108

Highest Daily Maximum	44	55	57	80	89	93	96	97	96	82	70	53	97
Date of Occurrence	4	1	31	30	29,30	5	12,17	18	5	6,8	3	21	8/18
Lowest Daily Minimum	4	-7	4	2	31	34	46	40	21	-9	9	2	-9
Date of Occurrence	16	4	2	3	8	9	1	31	9	26	30	13	10/26
Number of Days with:
Maximum >= 90°	0	0	0	0	0	4	21	23	3	0	0	0	51
Maximum <= 32°	11	18	1	5	0	0	0	0	0	4	1	13	53
Minimum <= 32°	31	29	30	18	2	0	0	0	5	17	23	3	158
Minimum <= 0°	0	7	0	0	0	0	0	0	0	2	0	0	9
Record High Temperatures Set or Tied	0	0	0	1	2	2	0	3	2	1	3	0	14
Record Low Temperatures Set or Tied	0	0	0	0	0	0	0	0	3	3	0	0	6

Temperature Ranks and Records:

Daily Records:

Record High Temperatures:

  April: 80 on the 30th (tie).

May: 86 on the 18th (tie, and 88 on the 31st.
June: 89 on the 1st, and 93 on the 5th (tie).

August: 96 on the 17th (tie), 97 on the 18th (tie), and 96 on the 24th (tie).

September: 96 on the 5th (also new all-time monthly high), 87 on the 24th.

  October: 82 on the 8th (tie).

November: 70 on the 3rd (tie), 69 on the 4th (tie), and 66 on the 18th.



Record Low Temperatures:

September: 26 on the 8th, 21 on the 9th, and 30 on the 10th.

October: -5 on the 25th, -9 on the 26th and 1 on the 27th.

Top Ten Warmest Months of August on Record
Rank	Year	Average Temperature °F
1	1983	74.0
2	2003	73.4
3	2020	73.3
3	1982	73.3
5	2013	73.2
6	1969	73.1
7	2012,2001, 2000	72.9
10	1970	72.8

Top Ten Warmest Years on Record
Rank	Year	Average Temperature °F
1	2012	49.0
2	1988, 1981	47.7
4	1934	47.6
5	1994	47.5
6	2006	47.4
7	1954	47.2
8	1999	47.0
9	2015	46.9
10	2016, 2007, 1990	46.6
22	2020	45.8

Top Ten Coldest Years on Record
Rank	Year	Average Temperature °F
1	1912	39.9
2	1944	40.1
3	1920	40.2
4	1916, 1898	40.9
6	1895	41.0
7	1924	41.1
8	1913, 1899, 1923	41.2
108	2020	45.8


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)	5.2	4.8	6.5	6.8	8.5	8.5	7.7	7.5	6.0	6.2	6.2	4.5	6.5
Maximum 3-sec Gust	47	43	49	63	59	61	62	65	65	59	70	49	70
Direction (degrees)	280	250	240	270	190	220	190	190	240	280	170	310	170
Date of Occurrence	13	24	31	30	20	6	22	11	19	12	7	22	11/7
Number of Days with:
2-Minute Wind >50 mph	0	0	0	0	0	0	0	0	0	0	1	0	1
Peak Wind >50 mph	0	0	0	2	3	4	4	6	1	2	5	0	27
Peak Wind >65 mph	0	0	0	0	0	0	0	1	1	0	2	0	4

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Precipitation Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	0.24	1.45	0.58	2.35	0.06	0.40	0.09	0.05	0.66	0.68	0.18	0.59	7.33
Mean Precip (1981-2010 Normals)	0.41	0.58	1.16	1.87	2.20	1.27	0.78	0.61	1.05	1.29	0.86	0.58	12.66
Departure from Normal	-0.17	0.87	-0.58	0.48	-2.14	-0.87	-0.69	-0.56	-0.39	-0.61	-0.68	0.01	-5.33
Percent of Normal	59	250	50	126	3	31	12	8	63	53	21	102	58
Rank - Driest to Wettest 129 years (P.O.R 1892-2020)	41	116	32	81	1 Tie	40	13	8	63	43	24	74	5
Greatest 24-HR Total	0.13	0.91	0.50	0.59	0.05	0.16	0.09	0.03	0.54	0.39	0.18	0.25	0.91
Dates of Occurrence	27	3	1	15	8	6	28	26	7	24	7	1	2/3
Number of Days with:
Precipitation >= 0.01	3	10	3	9	2	7	1	3	2	3	1	4	48
Precipitation >= 0.10	2	3	1	7	0	1	0	0	2	3	1	3	23
Precipitation >= 1.00	0	0	0	0	0	0	0	0	0	0	0	0	0
Days with Thunderstorms	0	0	0	0	2	4	0	7	0	0	0	0	13
Daily Precipitation Records Set or Tied	0	1	1	0	0	0	0	0	0	0	0	0	2

Precipitation Ranks and Records:

One Day Precipitation Records (inches):

February: 0.91" on the 3rd.

March: 0.50" on the 1st.

Top Ten Driest Months of May on Record
Rank	Year	Precipitation (inches)
1	2020	0.06
1	2006	0.06
3	1994	0.07
4	1984	0.27
5	1919	0.30
6	1974	0.31
7	1914	0.38
8	1990	0.42
9	1970	0.49
10	2001	0.50

Top Ten Driest Months of August on Record
Rank	Year	Precipitation (inches)
1	1960	0
1	1969	0
1	1970	0
4	1944	T
5	2013	0.01
6	1962	0.03
6	2012	0.03
8	2020	0.05
9	1902	0.06
10	1959, 1985, 2002	0.07

Top Ten Driest Years on Record
Rank	Year	Precipitation (inches)
1	2001	5.30
2	1954	6.41
3	2012	6.60
4	1902	7.25
5	2020	7.33
6	2006	7.42
7	1988	7.63
8	1939	7.95
9	2002	8.09
10	1914	8.32

Top Ten Wettest Years on Record
Rank	Year	Precipitation (inches)
1	1957	21.89
2	1923	21.56
3	2016	21.29
4	1941	20.66
5	1912	20.00
6	1947	19.70
7	1995	19.68
8	1944	19.57
9	1973	19.30
10	1908	19.22
125	2020	7.33


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)	3.6	20.7	7.5	30.5	0	0	0	0	4.7	7.8	0.001	9.3	84.1
Average Snowfall	7.6	10.3	16.1	16.8	4.8	0.1	0.0	0.0	2.7	9.8	13.1	10.1	91.4
Departure from Normal	-4	10.4	-.6	13.7	-4.8	-0.1	0.0	0.0	2	-2	-13.1	-0.8	-7.3
Percent of Normal	47	201	47	182	0	0	0	0	174	80	0	92	92
Rank - Least to Most 129 Years (P.O.R 1892-2020)	45	113	33	109	20	NA	NA	NA	112	77	6	79	63

Greatest 24-HR Total	1.9	13.1	6.9	9.1	0	0	0	0	2.7	3.8	T	4.6	13.1
Dates of Occurrence	29	3	1	15	NA	NA	NA	NA	8	24	11	1	2/3
Number of Days with:
Snowfall >= 1.0 inch	2	4	1	7	0	0	0	0	2	3	0	3	22
Daily Snowfall Records Set or Tied	0	1	1	1	0	0	0	0	1	0	0	0	4
* 35 months of May with a trace or less of snowfall on record * 64 months of September on record with no snowfall.

Snowfall Ranks and Records:

One Day Snowfall Records (inches):

February: 13.1 inches fell on the 3rd.

March: 6.9 inches fell on the 1st.

April: 9.1 inches fell on the 15th.

September: 2.7 inches fell on the 8th.

Least Snowiest November's on Record
Rank	Year	Snowfall (inches)
1	1899, 1914, 1939	0.0
4	1910, 2009	T
4	2020	T
7	1903, 1904, 1949	0.1
7	2008	0.1
11	1930	0.2

Top Ten Snowiest Years on Record
Rank	Year	Snowfall (inches)
1	1973	199.9
2	1975	160.7
3	1983	159.6
4	1967	154.6
5	1959	150.4
6	1971	148.3
7	2013	138.0
8	1978	128.1
9	1920	127.9
10	1892	125.1
72	2019	89.1



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

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Severe Thunderstorms and Heavy Rain in the Mid-Atlantic; Heat and Fire Weather Concerns in the West

Lander 2020 Annual Summary

Temperature Ranks and Records:

Precipitation Ranks and Records:

Snowfall Ranks and Records: