Allenspark 2SE Weather Records (USC00050183)

Record envelope, standing records and threshold days for Allenspark 2SE (USC00050183), Colorado, United States, with 50 years of record.

Key Facts for Allenspark 2SE

Allenspark 2SE (USC00050183) is a weather station in Colorado, United States at 40.19 latitude and -105.50 longitude, 2,504 m (8,215 ft) above sea level.
The station reports from 1944 to 1993, 50 years of record.
1,464 records set at Allenspark 2SE still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Allenspark 2SE set a daily record snowfall of 7.9 cm (3.1 in) on 19 December 1993.

About the Station

Location: Colorado, United States, 40.19 latitude, -105.50 longitude.
Elevation: 2,504 m (8,215 ft).
Period of record: 1944 to 1993, 50 years.
Eligible elements: tmax, tmin, prcp, snow.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Allenspark 2SE. 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 Allenspark 2SE, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-38.9 C (-38.0 F)	n/a	n/a
Feb	21.1 C (70.0 F)	-35.6 C (-32.1 F)	n/a	n/a
Mar	17.8 C (64.0 F)	-30.6 C (-23.1 F)	n/a	n/a
Apr	21.7 C (71.1 F)	-23.9 C (-11.0 F)	n/a	n/a
May	25.6 C (78.1 F)	-14.4 C (6.1 F)	n/a	n/a
Jun	32.8 C (91.0 F)	-7.8 C (18.0 F)	n/a	n/a
Jul	32.2 C (90.0 F)	-1.7 C (28.9 F)	n/a	n/a
Aug	30.6 C (87.1 F)	-2.8 C (27.0 F)	n/a	n/a
Sep	29.4 C (84.9 F)	-17.8 C (0.0 F)	n/a	n/a
Oct	24.4 C (75.9 F)	-23.3 C (-9.9 F)	n/a	n/a
Nov	21.1 C (70.0 F)	-27.8 C (-18.0 F)	n/a	n/a
Dec	18.3 C (64.9 F)	-32.2 C (-26.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Allenspark 2SE still stand. 1947 holds the most, with 52.

Standing records at Allenspark 2SE by the year they were set
Year set	Standing records
1945	36
1946	36
1947	52
1948	49
1949	28
1950	31
1951	35
1952	33
1953	50
1954	52
1955	29
1956	35
1957	32
1958	51
1959	40
1960	35
1961	27
1962	36
1963	32
1964	25
1965	29
1966	22
1967	23
1968	21
1969	31
1970	23
1971	35
1972	35
1973	14
1974	23
1975	37
1976	20
1977	51
1978	35
1979	20
1980	16
1982	12
1983	8
1984	30
1985	29
1986	37
1987	31
1988	27
1990	33
1991	24
1992	17
1993	37

Wettest Day of Each Month

Apr: 109.2 mm (4.3 in)

The wettest day on record for each calendar month at Allenspark 2SE. The most was 109.2 mm (4.3 in) on 2 April 1957.

Record daily precipitation for each month at Allenspark 2SE
Month	Record daily precipitation (mm)	Date
Jan	30.0 mm (1.2 in)	29 January 1951
Feb	22.9 mm (0.9 in)	18 February 1986
Mar	42.7 mm (1.7 in)	4 March 1992
Apr	109.2 mm (4.3 in)	2 April 1957
May	104.1 mm (4.1 in)	7 May 1969
Jun	85.1 mm (3.4 in)	4 June 1949
Jul	67.3 mm (2.6 in)	14 July 1974
Aug	42.7 mm (1.7 in)	4 August 1963
Sep	50.8 mm (2.0 in)	17 September 1971
Oct	58.4 mm (2.3 in)	22 October 1978
Nov	38.4 mm (1.5 in)	2 November 1946
Dec	25.4 mm (1.0 in)	4 December 1960

Period of Record Coverage

1944 to 1993

49 years of record at Allenspark 2SE, 1944 to 1993. 16 years have data for under 90 percent of days and are left out of rankings: 1944, 1964, 1969, 1971, 1980, 1981, 1982, 1983 and others.

Days with data per year at Allenspark 2SE
Year	Days with data	Share of year	Complete
1944	60	16%	No
1945	363	99%	Yes
1946	364	100%	Yes
1947	363	99%	Yes
1948	365	100%	Yes
1949	365	100%	Yes
1950	363	99%	Yes
1951	364	100%	Yes
1952	365	100%	Yes
1953	337	92%	Yes
1954	363	99%	Yes
1955	363	99%	Yes
1956	359	98%	Yes
1957	362	99%	Yes
1958	364	100%	Yes
1959	361	99%	Yes
1960	361	99%	Yes
1961	364	100%	Yes
1962	354	97%	Yes
1963	348	95%	Yes
1964	324	89%	No
1965	351	96%	Yes
1966	346	95%	Yes
1967	344	94%	Yes
1968	338	92%	Yes
1969	322	88%	No
1970	331	91%	Yes
1971	328	90%	No
1972	332	91%	Yes
1973	359	98%	Yes
1974	364	100%	Yes
1975	364	100%	Yes
1976	364	99%	Yes
1977	361	99%	Yes
1978	361	99%	Yes
1979	329	90%	Yes
1980	152	42%	No
1981	31	8%	No
1982	139	38%	No
1983	92	25%	No
1984	314	86%	No
1985	298	82%	No
1986	312	85%	No
1987	289	79%	No
1988	180	49%	No
1990	213	58%	No
1991	324	89%	No
1992	164	45%	No
1993	365	100%	Yes

Latest Records

Latest records at Allenspark 2SE
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
19 December 1993	Allenspark 2SE, US	daily snowfall	7.9 cm (3.1 in)	2.8 cm (1.1 in)	15 years	12 of 100 (Routine)
19 December 1993	Allenspark 2SE, US	daily rain	5.3 mm (0.21 in)	0.2 mm (0.01 in)	15 years	9 of 100 (Routine)
16 December 1993	Allenspark 2SE, US	daily rain	2.8 mm (0.11 in)	0.3 mm (0.01 in)	31 years	14 of 100 (Routine)
16 December 1993	Allenspark 2SE, US	daily low max	-7.8 C (18.0 F)	1.1 C (2.0 F)	22 years	12 of 100 (Routine)
11 December 1993	Allenspark 2SE, US	daily high max	14.4 C (57.9 F)	3.3 C (5.9 F)	43 years	22 of 100 (Routine)
25 November 1993	Allenspark 2SE, US	monthly low max	-13.9 C (7.0 F)	2.8 C (5.0 F)	43 years	31 of 100 (Routine)
25 November 1993	Allenspark 2SE, US	daily low min	-20.0 C (-4.0 F)	1.1 C (2.0 F)	14 years	10 of 100 (Routine)
24 November 1993	Allenspark 2SE, US	daily low max	-10.6 C (12.9 F)	1.2 C (2.2 F)	40 years	19 of 100 (Routine)
24 November 1993	Allenspark 2SE, US	daily low min	-21.1 C (-6.0 F)	2.8 C (5.0 F)	14 years	13 of 100 (Routine)
23 November 1993	Allenspark 2SE, US	daily snowfall	20.6 cm (8.1 in)	13.0 cm (5.1 in)	23 years	26 of 100 (Routine)
23 November 1993	Allenspark 2SE, US	daily rain	10.2 mm (0.4 in)	5.1 mm (0.20 in)	28 years	20 of 100 (Routine)
14 November 1993	Allenspark 2SE, US	daily low max	-5.0 C (23.0 F)	2.8 C (5.0 F)	24 years	16 of 100 (Routine)
6 November 1993	Allenspark 2SE, US	daily low max (Tie)	-1.7 C (28.9 F)	tie	3 years	1 of 100 (Routine)
5 November 1993	Allenspark 2SE, US	daily low max	-8.3 C (17.1 F)	5.0 C (9.0 F)	44 years	26 of 100 (Routine)
29 October 1993	Allenspark 2SE, US	daily low min	-21.1 C (-6.0 F)	3.3 C (5.9 F)	2 years	11 of 100 (Routine)
28 October 1993	Allenspark 2SE, US	daily snowfall	32.3 cm (12.7 in)	22.1 cm (8.7 in)	20 years	29 of 100 (Routine)
28 October 1993	Allenspark 2SE, US	daily rain	18.5 mm (0.7 in)	11.1 mm (0.4 in)	20 years	20 of 100 (Routine)
26 October 1993	Allenspark 2SE, US	daily low max	-0.6 C (30.9 F)	6.2 C (11.2 F)	40 years	28 of 100 (Routine)
19 October 1993	Allenspark 2SE, US	daily snowfall	1.3 cm (0.5 in)	1.3 cm (0.5 in)	48 years	20 of 100 (Routine)
17 October 1993	Allenspark 2SE, US	daily rain	17.3 mm (0.7 in)	14.0 mm (0.6 in)	3 years	20 of 100 (Routine)

Climate Trend

33 complete years, 1945 to 1993

One stripe for each of 33 complete years at Allenspark 2SE, 1945 to 1993. Blue stripes are years cooler than the station's own mean of 4.7 C (40.4 F); red stripes are warmer. The coolest year was 1993, at 2.9 C (37.2 F), and the warmest was 1977, at 6.9 C (44.4 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Allenspark 2SE as warming stripes, 1945 to 1993
Year	Annual mean temperature	Difference from the station mean
1945	4.3 C	-0.39 C
1946	5.2 C	+0.47 C
1947	4.3 C	-0.40 C
1948	4.3 C	-0.43 C
1949	5.0 C	+0.29 C
1950	5.1 C	+0.41 C
1951	4.0 C	-0.72 C
1952	4.9 C	+0.25 C
1954	6.6 C	+1.92 C
1955	4.8 C	+0.08 C
1956	5.4 C	+0.75 C
1957	5.0 C	+0.34 C
1958	6.0 C	+1.36 C
1959	4.6 C	-0.10 C
1960	4.6 C	-0.05 C
1961	3.8 C	-0.85 C
1962	4.9 C	+0.17 C
1963	4.9 C	+0.24 C
1965	3.9 C	-0.79 C
1966	4.8 C	+0.10 C
1967	4.1 C	-0.63 C
1968	4.1 C	-0.59 C
1969	4.6 C	-0.11 C
1970	4.0 C	-0.64 C
1971	3.8 C	-0.85 C
1972	4.6 C	-0.05 C
1973	4.1 C	-0.62 C
1974	5.0 C	+0.32 C
1975	3.9 C	-0.81 C
1976	5.2 C	+0.50 C
1977	6.9 C	+2.22 C
1978	5.1 C	+0.42 C
1993	2.9 C	-1.78 C

The fitted trend in annual mean temperature here over 1945 to 1993 is -0.2 C (-0.4 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.3 F (-0.7 to 0.2) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Allenspark 2SE
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.2 C (-0.4 to 0.1) per decade	-0.3 F (-0.7 to 0.2) per decade	1945 to 1993	33	Not clearly different from zero
Mean daily maximum	0.00 C (-0.39 to 0.39) per decade	0.00 F (-0.71 to 0.70) per decade	1945 to 1993	33	Not clearly different from zero
Mean daily minimum	-0.3 C (-0.5 to -0.1) per decade	-0.5 F (-0.9 to -0.2) per decade	1945 to 1993	33	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

1944 to 1993

Yearly extremes at Allenspark 2SE: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	32.8 C (91.0 F)	1954	28.9 C (84.0 F)	49
Coldest night (TNn)	-38.9 C (-38.0 F)	1963	-26.7 C (-16.1 F)	49
Wettest day (Rx1day)	109.2 mm (4.3 in)	1957	32.3 mm (1.3 in)	49
Wettest five days (Rx5day)	215.9 mm (8.5 in)	1969	57.6 mm (2.3 in)	49
Longest dry spell (CDD)	50 days	1992	26 days	49

Hottest day (TXx)

The hottest day of the year at Allenspark 2SE, 1944 to 1993. The record is 32.8 C (91.0 F) in 1954, marked on the chart; the median year is 28.9 C (84.0 F).

Hottest day (TXx) at Allenspark 2SE by year
Year	Hottest day (TXx)
1944	13.3 C (55.9 F)
1945	27.8 C (82.0 F)
1946	29.4 C (84.9 F)
1947	28.9 C (84.0 F)
1948	28.9 C (84.0 F)
1949	28.9 C (84.0 F)
1950	26.7 C (80.1 F)
1951	29.4 C (84.9 F)
1952	30.0 C (86.0 F)
1953	31.7 C (89.1 F)
1954	32.8 C (91.0 F)
1955	28.3 C (82.9 F)
1956	28.3 C (82.9 F)
1957	31.7 C (89.1 F)
1958	29.4 C (84.9 F)
1959	28.9 C (84.0 F)
1960	29.4 C (84.9 F)
1961	26.7 C (80.1 F)
1962	29.4 C (84.9 F)
1963	29.4 C (84.9 F)
1964	29.4 C (84.9 F)
1965	26.7 C (80.1 F)
1966	28.9 C (84.0 F)
1967	26.7 C (80.1 F)
1968	27.8 C (82.0 F)
1969	30.6 C (87.1 F)
1970	29.4 C (84.9 F)
1971	31.1 C (88.0 F)
1972	30.0 C (86.0 F)
1973	30.0 C (86.0 F)
1974	28.3 C (82.9 F)
1975	28.9 C (84.0 F)
1976	29.4 C (84.9 F)
1977	30.0 C (86.0 F)
1978	30.0 C (86.0 F)
1979	30.6 C (87.1 F)
1980	27.2 C (81.0 F)
1981	11.1 C (52.0 F)
1982	21.1 C (70.0 F)
1983	23.9 C (75.0 F)
1984	27.8 C (82.0 F)
1985	28.3 C (82.9 F)
1986	28.9 C (84.0 F)
1987	28.3 C (82.9 F)
1988	29.4 C (84.9 F)
1990	30.0 C (86.0 F)
1991	28.9 C (84.0 F)
1992	25.0 C (77.0 F)
1993	29.4 C (84.9 F)

Coldest night (TNn)

The coldest night of the year at Allenspark 2SE, 1944 to 1993. The record is -38.9 C (-38.0 F) in 1963, marked on the chart; the median year is -26.7 C (-16.1 F).

Coldest night (TNn) at Allenspark 2SE by year
Year	Coldest night (TNn)
1944	-15.6 C (3.9 F)
1945	-20.6 C (-5.1 F)
1946	-23.9 C (-11.0 F)
1947	-27.2 C (-17.0 F)
1948	-32.8 C (-27.0 F)
1949	-30.6 C (-23.1 F)
1950	-27.8 C (-18.0 F)
1951	-35.6 C (-32.1 F)
1952	-24.4 C (-11.9 F)
1953	-23.9 C (-11.0 F)
1954	-26.7 C (-16.1 F)
1955	-27.8 C (-18.0 F)
1956	-30.0 C (-22.0 F)
1957	-24.4 C (-11.9 F)
1958	-23.3 C (-9.9 F)
1959	-28.9 C (-20.0 F)
1960	-28.9 C (-20.0 F)
1961	-26.1 C (-15.0 F)
1962	-34.4 C (-29.9 F)
1963	-38.9 C (-38.0 F)
1964	-24.4 C (-11.9 F)
1965	-30.6 C (-23.1 F)
1966	-25.0 C (-13.0 F)
1967	-26.1 C (-15.0 F)
1968	-22.2 C (-8.0 F)
1969	-26.1 C (-15.0 F)
1970	-27.2 C (-17.0 F)
1971	-27.8 C (-18.0 F)
1972	-31.7 C (-25.1 F)
1973	-23.9 C (-11.0 F)
1974	-23.9 C (-11.0 F)
1975	-26.7 C (-16.1 F)
1976	-25.6 C (-14.1 F)
1977	-26.1 C (-15.0 F)
1978	-30.0 C (-22.0 F)
1979	-26.1 C (-15.0 F)
1980	-23.3 C (-9.9 F)
1981	-6.7 C (19.9 F)
1982	-28.9 C (-20.0 F)
1983	-31.7 C (-25.1 F)
1984	-26.7 C (-16.1 F)
1985	-34.4 C (-29.9 F)
1986	-28.3 C (-18.9 F)
1987	-32.2 C (-26.0 F)
1988	-34.4 C (-29.9 F)
1990	-32.2 C (-26.0 F)
1991	-25.6 C (-14.1 F)
1992	-24.4 C (-11.9 F)
1993	-24.4 C (-11.9 F)

Wettest day (Rx1day)

The wettest day of the year at Allenspark 2SE, 1944 to 1993. The record is 109.2 mm (4.3 in) in 1957, marked on the chart; the median year is 32.3 mm (1.3 in).

Wettest day (Rx1day) at Allenspark 2SE by year
Year	Wettest day (Rx1day)
1944	17.8 mm (0.7 in)
1945	26.4 mm (1.0 in)
1946	38.4 mm (1.5 in)
1947	48.0 mm (1.9 in)
1948	29.2 mm (1.1 in)
1949	85.1 mm (3.4 in)
1950	41.7 mm (1.6 in)
1951	35.6 mm (1.4 in)
1952	52.1 mm (2.1 in)
1953	26.7 mm (1.1 in)
1954	20.3 mm (0.8 in)
1955	30.5 mm (1.2 in)
1956	35.1 mm (1.4 in)
1957	109.2 mm (4.3 in)
1958	34.3 mm (1.4 in)
1959	26.7 mm (1.1 in)
1960	52.1 mm (2.1 in)
1961	30.5 mm (1.2 in)
1962	22.4 mm (0.9 in)
1963	63.8 mm (2.5 in)
1964	26.7 mm (1.1 in)
1965	64.8 mm (2.6 in)
1966	18.5 mm (0.7 in)
1967	30.5 mm (1.2 in)
1968	22.9 mm (0.9 in)
1969	104.1 mm (4.1 in)
1970	48.3 mm (1.9 in)
1971	50.8 mm (2.0 in)
1972	24.6 mm (1.0 in)
1973	59.7 mm (2.4 in)
1974	67.3 mm (2.6 in)
1975	67.6 mm (2.7 in)
1976	32.3 mm (1.3 in)
1977	48.3 mm (1.9 in)
1978	58.4 mm (2.3 in)
1979	25.4 mm (1.0 in)
1980	10.9 mm (0.4 in)
1981	12.7 mm (0.5 in)
1982	22.9 mm (0.9 in)
1983	32.0 mm (1.3 in)
1984	37.6 mm (1.5 in)
1985	31.0 mm (1.2 in)
1986	57.2 mm (2.3 in)
1987	26.9 mm (1.1 in)
1988	25.9 mm (1.0 in)
1990	17.0 mm (0.7 in)
1991	53.6 mm (2.1 in)
1992	42.7 mm (1.7 in)
1993	32.3 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Allenspark 2SE, 1944 to 1993. The record is 215.9 mm (8.5 in) in 1969, marked on the chart; the median year is 57.6 mm (2.3 in).

Wettest five days (Rx5day) at Allenspark 2SE by year
Year	Wettest five days (Rx5day)
1944	17.8 mm (0.7 in)
1945	58.7 mm (2.3 in)
1946	91.0 mm (3.6 in)
1947	68.6 mm (2.7 in)
1948	57.6 mm (2.3 in)
1949	141.7 mm (5.6 in)
1950	57.9 mm (2.3 in)
1951	60.4 mm (2.4 in)
1952	54.9 mm (2.2 in)
1953	35.6 mm (1.4 in)
1954	46.8 mm (1.8 in)
1955	60.7 mm (2.4 in)
1956	65.6 mm (2.6 in)
1957	116.3 mm (4.6 in)
1958	44.5 mm (1.8 in)
1959	56.1 mm (2.2 in)
1960	52.1 mm (2.1 in)
1961	63.3 mm (2.5 in)
1962	32.5 mm (1.3 in)
1963	113.3 mm (4.5 in)
1964	53.4 mm (2.1 in)
1965	109.2 mm (4.3 in)
1966	33.8 mm (1.3 in)
1967	59.7 mm (2.4 in)
1968	35.9 mm (1.4 in)
1969	215.9 mm (8.5 in)
1970	53.3 mm (2.1 in)
1971	96.2 mm (3.8 in)
1972	36.0 mm (1.4 in)
1973	69.0 mm (2.7 in)
1974	97.7 mm (3.8 in)
1975	80.3 mm (3.2 in)
1976	37.2 mm (1.5 in)
1977	114.3 mm (4.5 in)
1978	92.7 mm (3.6 in)
1979	36.1 mm (1.4 in)
1980	37.6 mm (1.5 in)
1981	25.5 mm (1.0 in)
1982	53.4 mm (2.1 in)
1983	60.1 mm (2.4 in)
1984	63.6 mm (2.5 in)
1985	46.2 mm (1.8 in)
1986	63.6 mm (2.5 in)
1987	41.8 mm (1.6 in)
1988	35.3 mm (1.4 in)
1990	32.0 mm (1.3 in)
1991	75.1 mm (3.0 in)
1992	54.4 mm (2.1 in)
1993	45.0 mm (1.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Allenspark 2SE, 1944 to 1993. The record is 50 days in 1992, marked on the chart; the median year is 26 days.

Longest dry spell (CDD) at Allenspark 2SE by year
Year	Longest dry spell (CDD)
1944	11 days
1945	21 days
1946	37 days
1947	24 days
1948	21 days
1949	28 days
1950	26 days
1951	30 days
1952	27 days
1953	26 days
1954	31 days
1955	28 days
1956	34 days
1957	22 days
1958	28 days
1959	35 days
1960	19 days
1961	29 days
1962	27 days
1963	35 days
1964	21 days
1965	24 days
1966	26 days
1967	18 days
1968	28 days
1969	21 days
1970	16 days
1971	29 days
1972	20 days
1973	26 days
1974	26 days
1975	37 days
1976	30 days
1977	33 days
1978	30 days
1979	38 days
1980	35 days
1981	9 days
1982	14 days
1983	30 days
1984	27 days
1985	22 days
1986	36 days
1987	25 days
1988	21 days
1990	20 days
1991	23 days
1992	50 days
1993	21 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

33 years with a frost

Across 33 years with a frost, the median last spring frost at Allenspark 2SE falls on 13 June and the median first autumn frost on 4 September, which leaves a median of 82 days between them.

Fitted over all years, the growing season changes by -7.9 days per decade at this station.

Frost dates and growing season at Allenspark 2SE
Measure	Median, all years	Earliest period	Recent period (1948 to 1993)	Recent against earliest	Fitted trend
Last spring frost	13 June	n/a	11 June	n/a	+0.1 days per decade
First autumn frost	4 September	n/a	3 September	n/a	-7.8 days per decade
Growing days	82 days	n/a	82 days	n/a	-7.9 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

39 years, 1945 to 1993

A day with at least 38.3 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 131.7 mm (5.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Allenspark 2SE: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	38.3 mm (1.5 in)
5 years	56.7 mm (2.2 in)
10 years	71.1 mm (2.8 in)
25 years	92.5 mm (3.6 in)
50 years	110.9 mm (4.4 in)	Longer than the 39 years of record
100 years	131.7 mm (5.2 in)	Longer than the 39 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, 39 years of values from 1945 to 1993.

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: 109.2 mm (4.3 in) in 1957; 104.1 mm (4.1 in) in 1969; 85.1 mm (3.4 in) in 1949.

Download the Data

Data for Allenspark 2SE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Allenspark 2SE 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).