Record envelope, standing records and threshold days for Siloam Springs (USC00036624), Arkansas, United States, with 46 years of record.
Key Facts for Siloam Springs
Siloam Springs (USC00036624) is a weather station in Arkansas, United States at 36.17 latitude and -94.53 longitude, 348 m (1,140 ft) above sea level.
The station reports from 1942 to 1987, 46 years of record.
1,464 records set at Siloam Springs still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Siloam Springs tied a daily record high minimum temperature of 12.2 C (54.0 F) on 24 December 1987.
About the Station
Location: Arkansas, United States, 36.17 latitude, -94.53 longitude.
Elevation: 348 m (1,140 ft).
Period of record: 1942 to 1987, 46 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Siloam Springs. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Siloam Springs, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.0 C (77.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Feb
28.3 C (82.9 F)
-23.3 C (-9.9 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-6.7 C (19.9 F)
n/a
n/a
May
33.3 C (91.9 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
39.4 C (102.9 F)
2.2 C (36.0 F)
n/a
n/a
Jul
43.9 C (111.0 F)
7.8 C (46.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
5.6 C (42.1 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
26.1 C (79.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Siloam Springs still stand. 1953 holds the most, with 66.
Standing records at Siloam Springs by the year they were set
Year set
Standing records
1942
27
1943
44
1944
22
1945
28
1946
24
1947
36
1948
32
1949
28
1950
51
1951
47
1952
37
1953
66
1954
52
1955
43
1956
43
1957
20
1958
25
1959
26
1960
34
1961
26
1962
45
1963
57
1964
24
1965
34
1966
24
1967
35
1968
28
1969
14
1970
35
1971
24
1972
29
1973
11
1974
39
1975
24
1976
40
1977
21
1978
30
1979
40
1980
33
1981
21
1982
27
1983
39
1984
19
1985
18
1986
25
1987
17
All-Time Record Progression
3 new records
3 all-time records were set at Siloam Springs between 9 June 1974 and 25 December 1983. Each dot is a new record.
When Siloam Springs set new all-time records
Date
Kind
Detail
1974-06-09
Record daily precipitation
Record daily precipitation 230.9 mm (9.1 in)
1982-01-11
Record low maximum temperature
Record low maximum temperature -16.7 C (1.9 F)
1983-12-25
Record low maximum temperature
Record low maximum temperature -17.2 C (1.0 F)
Wettest Day of Each Month
Jun: 230.9 mm (9.1 in)
The wettest day on record for each calendar month at Siloam Springs. The most was 230.9 mm (9.1 in) on 9 June 1974.
Record daily precipitation for each month at Siloam Springs
Month
Record daily precipitation (mm)
Date
Jan
91.4 mm (3.6 in)
30 January 1969
Feb
88.9 mm (3.5 in)
14 February 1951
Mar
81.0 mm (3.2 in)
30 March 1985
Apr
94.0 mm (3.7 in)
3 April 1957
May
185.4 mm (7.3 in)
10 May 1950
Jun
230.9 mm (9.1 in)
9 June 1974
Jul
101.6 mm (4.0 in)
12 July 1958
Aug
165.6 mm (6.5 in)
14 August 1961
Sep
157.5 mm (6.2 in)
29 September 1986
Oct
126.0 mm (5.0 in)
22 October 1972
Nov
102.1 mm (4.0 in)
4 November 1959
Dec
166.6 mm (6.6 in)
21 December 1984
Period of Record Coverage
1942 to 1987
Complete yearUnder 90 percent of days
46 years of record at Siloam Springs, 1942 to 1987. 2 years have data for under 90 percent of days and are left out of rankings: 1942, 1987.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Siloam Springs, 1943 to 1986. Blue stripes are years cooler than the station's own mean of 14.5 C (58.1 F); red stripes are warmer. The coolest year was 1979, at 12.8 C (55.1 F), and the warmest was 1954, at 15.9 C (60.7 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Siloam Springs as warming stripes, 1943 to 1986
Year
Annual mean temperature
Difference from the station mean
1943
14.6 C
+0.09 C
1944
15.0 C
+0.46 C
1945
14.4 C
-0.15 C
1946
15.8 C
+1.34 C
1948
14.7 C
+0.15 C
1949
14.8 C
+0.28 C
1950
14.2 C
-0.26 C
1951
14.5 C
-0.03 C
1954
15.9 C
+1.42 C
1955
14.0 C
-0.53 C
1956
14.9 C
+0.44 C
1957
14.7 C
+0.22 C
1958
13.9 C
-0.59 C
1959
14.9 C
+0.42 C
1960
14.4 C
-0.15 C
1961
14.4 C
-0.08 C
1962
15.1 C
+0.62 C
1963
15.7 C
+1.15 C
1964
15.6 C
+1.06 C
1965
15.9 C
+1.40 C
1966
14.5 C
+0.00 C
1967
14.9 C
+0.43 C
1968
13.8 C
-0.72 C
1969
14.4 C
-0.09 C
1970
14.4 C
-0.15 C
1971
14.7 C
+0.20 C
1972
14.4 C
-0.15 C
1973
14.6 C
+0.11 C
1974
14.7 C
+0.15 C
1975
13.8 C
-0.66 C
1976
13.3 C
-1.25 C
1977
14.5 C
+0.02 C
1978
13.5 C
-1.02 C
1979
12.8 C
-1.68 C
1980
14.7 C
+0.17 C
1981
14.2 C
-0.33 C
1982
13.8 C
-0.71 C
1983
13.2 C
-1.35 C
1984
13.8 C
-0.73 C
1986
14.9 C
+0.35 C
The annual mean temperature here has fallen by 0.3 C (0.1 to 0.4) per decade over 1943 to 1986. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Siloam Springs
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.3 C (-0.4 to -0.1) per decade
-0.5 F (-0.8 to -0.2) per decade
1943 to 1986
40
Fall
Mean daily maximum
-0.3 C (-0.5 to -0.1) per decade
-0.6 F (-1.0 to -0.2) per decade
1943 to 1986
40
Fall
Mean daily minimum
-0.19 C (-0.36 to -0.02) per decade
-0.34 F (-0.65 to -0.03) per decade
1943 to 1986
40
Fall
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1942 to 1987
Yearly extremes at Siloam Springs: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.9 C (111.0 F)
1954
37.8 C (100.0 F)
46
Coldest night (TNn)
-24.4 C (-11.9 F)
1970
-18.3 C (-0.9 F)
46
Wettest day (Rx1day)
230.9 mm (9.1 in)
1974
79.7 mm (3.1 in)
46
Wettest five days (Rx5day)
303.1 mm (11.9 in)
1974
131.4 mm (5.2 in)
46
Longest dry spell (CDD)
40 days
1955
22 days
46
Hottest day (TXx)
The hottest day of the year at Siloam Springs, 1942 to 1987. The record is 43.9 C (111.0 F) in 1954, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Siloam Springs by year
Year
Hottest day (TXx)
1942
36.7 C (98.1 F)
1943
43.3 C (109.9 F)
1944
37.2 C (99.0 F)
1945
36.1 C (97.0 F)
1946
40.0 C (104.0 F)
1947
40.6 C (105.1 F)
1948
35.0 C (95.0 F)
1949
37.8 C (100.0 F)
1950
36.1 C (97.0 F)
1951
38.3 C (100.9 F)
1952
39.4 C (102.9 F)
1953
38.9 C (102.0 F)
1954
43.9 C (111.0 F)
1955
37.2 C (99.0 F)
1956
42.2 C (108.0 F)
1957
40.0 C (104.0 F)
1958
35.0 C (95.0 F)
1959
36.1 C (97.0 F)
1960
36.7 C (98.1 F)
1961
35.0 C (95.0 F)
1962
37.8 C (100.0 F)
1963
42.2 C (108.0 F)
1964
42.8 C (109.0 F)
1965
40.0 C (104.0 F)
1966
40.6 C (105.1 F)
1967
37.2 C (99.0 F)
1968
36.7 C (98.1 F)
1969
39.4 C (102.9 F)
1970
40.6 C (105.1 F)
1971
36.7 C (98.1 F)
1972
37.8 C (100.0 F)
1973
34.4 C (93.9 F)
1974
41.1 C (106.0 F)
1975
36.1 C (97.0 F)
1976
36.7 C (98.1 F)
1977
38.9 C (102.0 F)
1978
37.8 C (100.0 F)
1979
36.1 C (97.0 F)
1980
41.7 C (107.1 F)
1981
38.9 C (102.0 F)
1982
37.8 C (100.0 F)
1983
37.8 C (100.0 F)
1984
39.4 C (102.9 F)
1985
36.7 C (98.1 F)
1986
40.6 C (105.1 F)
1987
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Siloam Springs, 1942 to 1987. The record is -24.4 C (-11.9 F) in 1970, marked on the chart; the median year is -18.3 C (-0.9 F).
Coldest night (TNn) at Siloam Springs by year
Year
Coldest night (TNn)
1942
-15.6 C (3.9 F)
1943
-22.2 C (-8.0 F)
1944
-20.6 C (-5.1 F)
1945
-18.3 C (-0.9 F)
1946
-13.3 C (8.1 F)
1947
-18.9 C (-2.0 F)
1948
-21.7 C (-7.1 F)
1949
-17.8 C (0.0 F)
1950
-19.4 C (-2.9 F)
1951
-23.3 C (-9.9 F)
1952
-11.1 C (12.0 F)
1953
-14.4 C (6.1 F)
1954
-13.9 C (7.0 F)
1955
-16.7 C (1.9 F)
1956
-13.9 C (7.0 F)
1957
-14.4 C (6.1 F)
1958
-18.9 C (-2.0 F)
1959
-19.4 C (-2.9 F)
1960
-14.4 C (6.1 F)
1961
-16.7 C (1.9 F)
1962
-21.7 C (-7.1 F)
1963
-22.2 C (-8.0 F)
1964
-17.8 C (0.0 F)
1965
-16.7 C (1.9 F)
1966
-19.4 C (-2.9 F)
1967
-12.2 C (10.0 F)
1968
-19.4 C (-2.9 F)
1969
-15.0 C (5.0 F)
1970
-24.4 C (-11.9 F)
1971
-22.8 C (-9.0 F)
1972
-18.3 C (-0.9 F)
1973
-18.3 C (-0.9 F)
1974
-16.7 C (1.9 F)
1975
-16.1 C (3.0 F)
1976
-17.8 C (0.0 F)
1977
-24.4 C (-11.9 F)
1978
-18.3 C (-0.9 F)
1979
-22.2 C (-8.0 F)
1980
-15.0 C (5.0 F)
1981
-21.1 C (-6.0 F)
1982
-20.6 C (-5.1 F)
1983
-22.2 C (-8.0 F)
1984
-23.9 C (-11.0 F)
1985
-23.9 C (-11.0 F)
1986
-14.4 C (6.1 F)
1987
-10.0 C (14.0 F)
Wettest day (Rx1day)
The wettest day of the year at Siloam Springs, 1942 to 1987. The record is 230.9 mm (9.1 in) in 1974, marked on the chart; the median year is 79.7 mm (3.1 in).
Wettest day (Rx1day) at Siloam Springs by year
Year
Wettest day (Rx1day)
1942
90.9 mm (3.6 in)
1943
133.4 mm (5.3 in)
1944
61.0 mm (2.4 in)
1945
85.6 mm (3.4 in)
1946
60.7 mm (2.4 in)
1947
76.5 mm (3.0 in)
1948
124.5 mm (4.9 in)
1949
94.0 mm (3.7 in)
1950
185.4 mm (7.3 in)
1951
88.9 mm (3.5 in)
1952
78.2 mm (3.1 in)
1953
53.3 mm (2.1 in)
1954
72.4 mm (2.9 in)
1955
48.8 mm (1.9 in)
1956
53.8 mm (2.1 in)
1957
94.0 mm (3.7 in)
1958
101.6 mm (4.0 in)
1959
102.1 mm (4.0 in)
1960
69.6 mm (2.7 in)
1961
165.6 mm (6.5 in)
1962
158.5 mm (6.2 in)
1963
59.4 mm (2.3 in)
1964
70.4 mm (2.8 in)
1965
71.9 mm (2.8 in)
1966
62.7 mm (2.5 in)
1967
79.5 mm (3.1 in)
1968
69.1 mm (2.7 in)
1969
91.4 mm (3.6 in)
1970
78.7 mm (3.1 in)
1971
91.4 mm (3.6 in)
1972
126.0 mm (5.0 in)
1973
79.8 mm (3.1 in)
1974
230.9 mm (9.1 in)
1975
91.7 mm (3.6 in)
1976
66.0 mm (2.6 in)
1977
83.8 mm (3.3 in)
1978
59.2 mm (2.3 in)
1979
85.1 mm (3.4 in)
1980
41.4 mm (1.6 in)
1981
69.9 mm (2.8 in)
1982
64.8 mm (2.6 in)
1983
47.0 mm (1.9 in)
1984
166.6 mm (6.6 in)
1985
81.0 mm (3.2 in)
1986
157.5 mm (6.2 in)
1987
59.7 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Siloam Springs, 1942 to 1987. The record is 303.1 mm (11.9 in) in 1974, marked on the chart; the median year is 131.4 mm (5.2 in).
Wettest five days (Rx5day) at Siloam Springs by year
Year
Wettest five days (Rx5day)
1942
131.9 mm (5.2 in)
1943
255.3 mm (10.1 in)
1944
133.4 mm (5.3 in)
1945
169.0 mm (6.7 in)
1946
135.1 mm (5.3 in)
1947
111.6 mm (4.4 in)
1948
178.8 mm (7.0 in)
1949
129.9 mm (5.1 in)
1950
260.4 mm (10.3 in)
1951
141.0 mm (5.6 in)
1952
112.3 mm (4.4 in)
1953
109.5 mm (4.3 in)
1954
143.5 mm (5.6 in)
1955
97.3 mm (3.8 in)
1956
105.1 mm (4.1 in)
1957
138.9 mm (5.5 in)
1958
113.8 mm (4.5 in)
1959
155.8 mm (6.1 in)
1960
140.2 mm (5.5 in)
1961
210.1 mm (8.3 in)
1962
177.6 mm (7.0 in)
1963
96.7 mm (3.8 in)
1964
124.7 mm (4.9 in)
1965
143.8 mm (5.7 in)
1966
106.4 mm (4.2 in)
1967
109.4 mm (4.3 in)
1968
120.7 mm (4.8 in)
1969
166.9 mm (6.6 in)
1970
140.9 mm (5.5 in)
1971
93.7 mm (3.7 in)
1972
130.8 mm (5.1 in)
1973
120.7 mm (4.8 in)
1974
303.1 mm (11.9 in)
1975
125.0 mm (4.9 in)
1976
151.0 mm (5.9 in)
1977
86.6 mm (3.4 in)
1978
98.5 mm (3.9 in)
1979
141.0 mm (5.6 in)
1980
68.3 mm (2.7 in)
1981
110.0 mm (4.3 in)
1982
127.9 mm (5.0 in)
1983
65.0 mm (2.6 in)
1984
175.2 mm (6.9 in)
1985
138.2 mm (5.4 in)
1986
198.2 mm (7.8 in)
1987
90.0 mm (3.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Siloam Springs, 1942 to 1987. The record is 40 days in 1955, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Siloam Springs by year
Year
Longest dry spell (CDD)
1942
23 days
1943
33 days
1944
26 days
1945
18 days
1946
22 days
1947
36 days
1948
26 days
1949
21 days
1950
26 days
1951
17 days
1952
29 days
1953
18 days
1954
24 days
1955
40 days
1956
21 days
1957
17 days
1958
20 days
1959
26 days
1960
28 days
1961
21 days
1962
22 days
1963
36 days
1964
21 days
1965
23 days
1966
19 days
1967
26 days
1968
17 days
1969
23 days
1970
28 days
1971
21 days
1972
29 days
1973
19 days
1974
21 days
1975
16 days
1976
24 days
1977
22 days
1978
17 days
1979
31 days
1980
24 days
1981
21 days
1982
19 days
1983
21 days
1984
13 days
1985
32 days
1986
32 days
1987
19 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
40 years with a frost
Across 40 years with a frost, the median last spring frost at Siloam Springs falls on 14 April and the median first autumn frost on 20 October, which leaves a median of 195 days between them.
Fitted over all years, the growing season changes by +0.7 days per decade at this station.
Frost dates and growing season at Siloam Springs
Measure
Median, all years
Earliest period
Recent period (1956 to 1986)
Recent against earliest
Fitted trend
Last spring frost
14 April
n/a
14 April
n/a
-1.9 days per decade
First autumn frost
20 October
n/a
21 October
n/a
-1.1 days per decade
Growing days
195 days
n/a
195 days
n/a
+0.7 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
45 years, 1943 to 1987
A day with at least 79.4 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 263.9 mm (10.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Siloam Springs: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
79.4 mm (3.1 in)
5 years
111.6 mm (4.4 in)
10 years
138.5 mm (5.5 in)
25 years
180.5 mm (7.1 in)
50 years
218.7 mm (8.6 in)
Longer than the 45 years of record
100 years
263.9 mm (10.4 in)
Longer than the 45 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 45 years of values from 1943 to 1987.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 230.9 mm (9.1 in) in 1974; 185.4 mm (7.3 in) in 1950; 166.6 mm (6.6 in) in 1984.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Siloam Springs, at 1959. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1959 ran 0.3 C (0.5 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Siloam Springs, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1959
+0.3
+0.5
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Siloam Springs standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Siloam Springs threshold days by year: CSV or JSON. Field meanings are on the data page.
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.