Record envelope, standing records and threshold days for Blanca 4 NW (USC00050776), Colorado, United States, with 102 years of record.
Key Facts for Blanca 4 NW
Blanca 4 NW (USC00050776) is a weather station in Colorado, United States at 37.48 latitude and -105.57 longitude, 2,350 m (7,709 ft) above sea level.
The station reports from 1909 to 2010, 102 years of record.
1,464 records set at Blanca 4 NW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Blanca 4 NW tied a daily record low minimum temperature of -15.0 C (5.0 F) on 10 March 2010.
About the Station
Location: Colorado, United States, 37.48 latitude, -105.57 longitude.
Elevation: 2,350 m (7,709 ft).
Period of record: 1909 to 2010, 102 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 Blanca 4 NW. 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 Blanca 4 NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Feb
18.9 C (66.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Mar
22.2 C (72.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Apr
26.7 C (80.1 F)
-17.8 C (0.0 F)
n/a
n/a
May
31.7 C (89.1 F)
-16.7 C (1.9 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
36.1 C (97.0 F)
-1.7 C (28.9 F)
n/a
n/a
Aug
34.4 C (93.9 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
33.3 C (91.9 F)
-8.9 C (16.0 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-20.0 C (-4.0 F)
n/a
n/a
Nov
21.7 C (71.1 F)
-28.3 C (-18.9 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-36.7 C (-34.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Blanca 4 NW still stand. 1929 holds the most, with 51.
Standing records at Blanca 4 NW by the year they were set
Year set
Standing records
1909
33
1910
32
1911
24
1912
4
1913
23
1914
16
1915
17
1916
25
1917
2
1925
11
1926
22
1927
14
1928
20
1929
51
1930
17
1960
19
1961
19
1962
46
1963
30
1964
30
1965
30
1966
19
1967
18
1968
18
1969
19
1970
18
1971
42
1972
9
1973
15
1974
24
1975
33
1976
20
1977
25
1978
14
1979
36
1980
32
1981
27
1982
13
1983
21
1984
24
1985
22
1986
21
1987
11
1988
10
1989
27
1990
28
1991
19
1992
15
1993
21
1994
15
1995
21
1996
25
1997
18
1998
19
1999
16
2000
24
2001
12
2002
18
2003
18
2004
35
2005
24
2006
27
2007
28
2008
42
2009
36
All-Time Record Progression
4 new records
4 all-time records were set at Blanca 4 NW between 20 November 1994 and 6 June 2007. Each dot is a new record.
When Blanca 4 NW set new all-time records
Date
Kind
Detail
1994-11-20
Record daily snowfall
Record daily snowfall 33.0 cm (13.0 in)
1994-11-20
Record snow depth
Record snow depth 33.0 cm (13.0 in)
2004-08-06
Record high minimum temperature
Record high minimum temperature 15.6 C (60.1 F)
2007-06-06
Record high minimum temperature
Record high minimum temperature 18.9 C (66.0 F)
Wettest Day of Each Month
Apr: 57.2 mm (2.3 in)
The wettest day on record for each calendar month at Blanca 4 NW. The most was 57.2 mm (2.3 in) on 7 April 1915.
Record daily precipitation for each month at Blanca 4 NW
Month
Record daily precipitation (mm)
Date
Jan
19.1 mm (0.8 in)
26 January 2004
Feb
25.4 mm (1.0 in)
17 February 1945
Mar
26.7 mm (1.1 in)
24 March 2007
Apr
57.2 mm (2.3 in)
7 April 1915
May
31.5 mm (1.2 in)
9 May 1957
Jun
30.0 mm (1.2 in)
11 June 1913
Jul
41.7 mm (1.6 in)
2 July 1911
Aug
36.1 mm (1.4 in)
7 August 2001
Sep
37.3 mm (1.5 in)
21 September 1997
Oct
25.4 mm (1.0 in)
9 October 2006
Nov
27.4 mm (1.1 in)
20 November 1994
Dec
18.0 mm (0.7 in)
12 December 1991
Period of Record Coverage
1909 to 2010
Complete yearUnder 90 percent of days
66 years of record at Blanca 4 NW, 1909 to 2010. 15 years have data for under 90 percent of days and are left out of rankings: 1911, 1912, 1914, 1917, 1925, 1927, 1929, 1930 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 46 complete years at Blanca 4 NW, 1909 to 2009. Blue stripes are years cooler than the station's own mean of 5.7 C (42.3 F); red stripes are warmer. The coolest year was 1992, at 4.1 C (39.3 F), and the warmest was 2000, at 7.2 C (44.9 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Blanca 4 NW as warming stripes, 1909 to 2009
Year
Annual mean temperature
Difference from the station mean
1909
5.4 C
-0.33 C
1910
6.4 C
+0.65 C
1913
4.6 C
-1.15 C
1915
5.0 C
-0.74 C
1916
5.9 C
+0.13 C
1926
5.5 C
-0.28 C
1961
5.3 C
-0.44 C
1962
6.2 C
+0.45 C
1963
6.4 C
+0.68 C
1964
4.5 C
-1.22 C
1965
5.6 C
-0.16 C
1966
5.7 C
-0.06 C
1967
5.7 C
-0.03 C
1968
5.1 C
-0.63 C
1969
6.0 C
+0.28 C
1970
5.5 C
-0.21 C
1971
5.1 C
-0.63 C
1972
5.6 C
-0.12 C
1973
4.4 C
-1.31 C
1974
4.1 C
-1.63 C
1976
5.0 C
-0.77 C
1977
6.1 C
+0.41 C
1978
6.4 C
+0.63 C
1979
4.4 C
-1.32 C
1980
6.8 C
+1.03 C
1982
5.7 C
-0.04 C
1984
4.7 C
-1.04 C
1986
6.4 C
+0.63 C
1987
5.8 C
+0.03 C
1989
6.3 C
+0.61 C
1990
5.9 C
+0.18 C
1991
4.6 C
-1.10 C
1992
4.1 C
-1.68 C
1993
5.1 C
-0.66 C
1995
6.7 C
+0.93 C
1996
6.7 C
+0.97 C
1997
5.6 C
-0.10 C
1998
6.3 C
+0.60 C
1999
6.7 C
+0.93 C
2000
7.2 C
+1.46 C
2001
6.6 C
+0.88 C
2002
6.6 C
+0.82 C
2003
6.9 C
+1.16 C
2006
6.7 C
+0.98 C
2008
5.9 C
+0.17 C
2009
6.7 C
+0.94 C
The annual mean temperature here has risen by 0.10 C (0.01 to 0.19) per decade over 1909 to 2009. In Fahrenheit: 0.18 F (0.02 to 0.33) per decade. The slope is a straight line fitted to 46 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Blanca 4 NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (0.01 to 0.19) per decade
0.18 F (0.02 to 0.33) per decade
1909 to 2009
46
Rise
Mean daily maximum
0.13 C (0.02 to 0.23) per decade
0.23 F (0.04 to 0.42) per decade
1909 to 2009
46
Rise
Mean daily minimum
0.07 C (-0.03 to 0.17) per decade
0.1 F (-0.1 to 0.3) per decade
1909 to 2009
46
Not clearly different from zero
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
1909 to 2010
Yearly extremes at Blanca 4 NW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.1 C (97.0 F)
1961
32.0 C (89.5 F)
66
Coldest night (TNn)
-38.9 C (-38.0 F)
1963
-28.3 C (-18.9 F)
66
Wettest day (Rx1day)
57.2 mm (2.3 in)
1915
19.8 mm (0.8 in)
83
Wettest five days (Rx5day)
73.1 mm (2.9 in)
2006
29.7 mm (1.2 in)
83
Longest dry spell (CDD)
106 days
1966
46 days
83
Hottest day (TXx)
The hottest day of the year at Blanca 4 NW, 1909 to 2010. The record is 36.1 C (97.0 F) in 1961, marked on the chart; the median year is 32.0 C (89.5 F).
Hottest day (TXx) at Blanca 4 NW by year
Year
Hottest day (TXx)
1909
32.2 C (90.0 F)
1910
31.7 C (89.1 F)
1911
31.1 C (88.0 F)
1912
18.9 C (66.0 F)
1913
30.6 C (87.1 F)
1914
29.4 C (84.9 F)
1915
30.6 C (87.1 F)
1916
31.1 C (88.0 F)
1917
5.6 C (42.1 F)
1925
31.7 C (89.1 F)
1926
31.1 C (88.0 F)
1927
15.6 C (60.1 F)
1928
30.6 C (87.1 F)
1929
31.1 C (88.0 F)
1930
30.6 C (87.1 F)
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
32.8 C (91.0 F)
1961
36.1 C (97.0 F)
1962
32.2 C (90.0 F)
1963
32.8 C (91.0 F)
1964
36.1 C (97.0 F)
1965
30.6 C (87.1 F)
1966
32.2 C (90.0 F)
1967
31.1 C (88.0 F)
1968
31.7 C (89.1 F)
1969
31.7 C (89.1 F)
1970
32.2 C (90.0 F)
1971
33.9 C (93.0 F)
1972
32.2 C (90.0 F)
1973
32.2 C (90.0 F)
1974
32.2 C (90.0 F)
1975
30.6 C (87.1 F)
1976
31.7 C (89.1 F)
1977
31.1 C (88.0 F)
1978
31.7 C (89.1 F)
1979
32.2 C (90.0 F)
1980
32.2 C (90.0 F)
1981
32.2 C (90.0 F)
1982
32.2 C (90.0 F)
1983
30.6 C (87.1 F)
1984
31.7 C (89.1 F)
1985
32.2 C (90.0 F)
1986
32.2 C (90.0 F)
1987
32.8 C (91.0 F)
1988
31.7 C (89.1 F)
1989
33.9 C (93.0 F)
1990
33.3 C (91.9 F)
1991
31.7 C (89.1 F)
1992
30.6 C (87.1 F)
1993
30.0 C (86.0 F)
1994
32.8 C (91.0 F)
1995
32.8 C (91.0 F)
1996
32.2 C (90.0 F)
1997
31.7 C (89.1 F)
1998
33.3 C (91.9 F)
1999
31.7 C (89.1 F)
2000
30.6 C (87.1 F)
2001
31.7 C (89.1 F)
2002
32.8 C (91.0 F)
2003
35.6 C (96.1 F)
2004
32.8 C (91.0 F)
2005
33.3 C (91.9 F)
2006
32.8 C (91.0 F)
2007
33.3 C (91.9 F)
2008
34.4 C (93.9 F)
2009
33.9 C (93.0 F)
2010
12.8 C (55.0 F)
Coldest night (TNn)
The coldest night of the year at Blanca 4 NW, 1909 to 2010. The record is -38.9 C (-38.0 F) in 1963, marked on the chart; the median year is -28.3 C (-18.9 F).
Coldest night (TNn) at Blanca 4 NW by year
Year
Coldest night (TNn)
1909
-32.8 C (-27.0 F)
1910
-27.2 C (-17.0 F)
1911
-26.1 C (-15.0 F)
1912
-26.7 C (-16.1 F)
1913
-32.2 C (-26.0 F)
1914
-26.7 C (-16.1 F)
1915
-34.4 C (-29.9 F)
1916
-26.7 C (-16.1 F)
1917
-24.4 C (-11.9 F)
1925
-18.9 C (-2.0 F)
1926
-28.9 C (-20.0 F)
1927
-19.4 C (-2.9 F)
1928
-25.6 C (-14.1 F)
1929
-31.7 C (-25.1 F)
1930
-33.3 C (-27.9 F)
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
-26.1 C (-15.0 F)
1961
-36.7 C (-34.1 F)
1962
-30.6 C (-23.1 F)
1963
-38.9 C (-38.0 F)
1964
-33.3 C (-27.9 F)
1965
-30.0 C (-22.0 F)
1966
-31.1 C (-24.0 F)
1967
-30.0 C (-22.0 F)
1968
-30.0 C (-22.0 F)
1969
-26.1 C (-15.0 F)
1970
-28.3 C (-18.9 F)
1971
-38.9 C (-38.0 F)
1972
-27.8 C (-18.0 F)
1973
-28.9 C (-20.0 F)
1974
-35.6 C (-32.1 F)
1975
-35.6 C (-32.1 F)
1976
-26.7 C (-16.1 F)
1977
-26.1 C (-15.0 F)
1978
-31.7 C (-25.1 F)
1979
-35.6 C (-32.1 F)
1980
-24.4 C (-11.9 F)
1981
-20.0 C (-4.0 F)
1982
-28.3 C (-18.9 F)
1983
-24.4 C (-11.9 F)
1984
-33.3 C (-27.9 F)
1985
-28.3 C (-18.9 F)
1986
-22.2 C (-8.0 F)
1987
-30.6 C (-23.1 F)
1988
-32.2 C (-26.0 F)
1989
-31.1 C (-24.0 F)
1990
-32.8 C (-27.0 F)
1991
-27.2 C (-17.0 F)
1992
-33.3 C (-27.9 F)
1993
-24.4 C (-11.9 F)
1994
-30.6 C (-23.1 F)
1995
-22.8 C (-9.0 F)
1996
-22.8 C (-9.0 F)
1997
-27.8 C (-18.0 F)
1998
-21.1 C (-6.0 F)
1999
-21.7 C (-7.1 F)
2000
-22.2 C (-8.0 F)
2001
-25.6 C (-14.1 F)
2002
-26.1 C (-15.0 F)
2003
-23.3 C (-9.9 F)
2004
-28.9 C (-20.0 F)
2005
-26.7 C (-16.1 F)
2006
-36.1 C (-33.0 F)
2007
-33.3 C (-27.9 F)
2008
-34.4 C (-29.9 F)
2009
-26.1 C (-15.0 F)
2010
-24.4 C (-11.9 F)
Wettest day (Rx1day)
The wettest day of the year at Blanca 4 NW, 1909 to 2010. The record is 57.2 mm (2.3 in) in 1915, marked on the chart; the median year is 19.8 mm (0.8 in).
Wettest day (Rx1day) at Blanca 4 NW by year
Year
Wettest day (Rx1day)
1909
34.8 mm (1.4 in)
1910
14.0 mm (0.6 in)
1911
41.7 mm (1.6 in)
1912
14.0 mm (0.6 in)
1913
30.0 mm (1.2 in)
1914
25.4 mm (1.0 in)
1915
57.2 mm (2.3 in)
1916
24.6 mm (1.0 in)
1917
2.5 mm (0.10 in)
1925
11.4 mm (0.4 in)
1926
20.3 mm (0.8 in)
1927
14.5 mm (0.6 in)
1928
16.5 mm (0.6 in)
1929
27.2 mm (1.1 in)
1930
20.3 mm (0.8 in)
1943
20.3 mm (0.8 in)
1944
26.9 mm (1.1 in)
1945
25.4 mm (1.0 in)
1946
17.8 mm (0.7 in)
1947
17.8 mm (0.7 in)
1948
18.3 mm (0.7 in)
1949
12.7 mm (0.5 in)
1950
12.7 mm (0.5 in)
1951
12.7 mm (0.5 in)
1952
16.0 mm (0.6 in)
1953
20.3 mm (0.8 in)
1954
19.1 mm (0.8 in)
1955
21.3 mm (0.8 in)
1956
19.1 mm (0.8 in)
1957
31.5 mm (1.2 in)
1958
15.0 mm (0.6 in)
1959
19.8 mm (0.8 in)
1960
15.7 mm (0.6 in)
1961
18.3 mm (0.7 in)
1962
17.3 mm (0.7 in)
1963
13.7 mm (0.5 in)
1964
21.8 mm (0.9 in)
1965
19.8 mm (0.8 in)
1966
22.9 mm (0.9 in)
1967
19.1 mm (0.8 in)
1968
24.1 mm (0.9 in)
1969
18.3 mm (0.7 in)
1970
19.8 mm (0.8 in)
1971
20.3 mm (0.8 in)
1972
11.4 mm (0.4 in)
1973
17.8 mm (0.7 in)
1974
19.8 mm (0.8 in)
1975
6.4 mm (0.25 in)
1976
19.3 mm (0.8 in)
1977
12.2 mm (0.5 in)
1978
24.4 mm (1.0 in)
1979
26.2 mm (1.0 in)
1980
22.9 mm (0.9 in)
1981
21.6 mm (0.9 in)
1982
23.9 mm (0.9 in)
1983
22.4 mm (0.9 in)
1984
15.7 mm (0.6 in)
1985
19.6 mm (0.8 in)
1986
28.4 mm (1.1 in)
1987
16.3 mm (0.6 in)
1988
20.6 mm (0.8 in)
1989
16.0 mm (0.6 in)
1990
21.6 mm (0.9 in)
1991
20.1 mm (0.8 in)
1992
26.7 mm (1.1 in)
1993
19.3 mm (0.8 in)
1994
27.4 mm (1.1 in)
1995
20.3 mm (0.8 in)
1996
16.5 mm (0.6 in)
1997
37.3 mm (1.5 in)
1998
17.8 mm (0.7 in)
1999
27.9 mm (1.1 in)
2000
20.8 mm (0.8 in)
2001
36.1 mm (1.4 in)
2002
17.8 mm (0.7 in)
2003
30.7 mm (1.2 in)
2004
30.7 mm (1.2 in)
2005
20.6 mm (0.8 in)
2006
31.0 mm (1.2 in)
2007
26.7 mm (1.1 in)
2008
17.8 mm (0.7 in)
2009
15.2 mm (0.6 in)
2010
3.8 mm (0.15 in)
Wettest five days (Rx5day)
The wettest five days of the year at Blanca 4 NW, 1909 to 2010. The record is 73.1 mm (2.9 in) in 2006, marked on the chart; the median year is 29.7 mm (1.2 in).
Wettest five days (Rx5day) at Blanca 4 NW by year
Year
Wettest five days (Rx5day)
1909
54.8 mm (2.2 in)
1910
32.6 mm (1.3 in)
1911
49.1 mm (1.9 in)
1912
14.0 mm (0.6 in)
1913
55.4 mm (2.2 in)
1914
38.1 mm (1.5 in)
1915
57.2 mm (2.3 in)
1916
48.0 mm (1.9 in)
1917
3.8 mm (0.15 in)
1925
10.6 mm (0.4 in)
1926
38.1 mm (1.5 in)
1927
14.5 mm (0.6 in)
1928
23.9 mm (0.9 in)
1929
42.5 mm (1.7 in)
1930
52.1 mm (2.1 in)
1943
22.6 mm (0.9 in)
1944
32.0 mm (1.3 in)
1945
38.6 mm (1.5 in)
1946
29.0 mm (1.1 in)
1947
25.4 mm (1.0 in)
1948
23.9 mm (0.9 in)
1949
22.3 mm (0.9 in)
1950
19.3 mm (0.8 in)
1951
20.3 mm (0.8 in)
1952
25.4 mm (1.0 in)
1953
41.8 mm (1.6 in)
1954
30.5 mm (1.2 in)
1955
52.0 mm (2.0 in)
1956
27.9 mm (1.1 in)
1957
58.2 mm (2.3 in)
1958
25.7 mm (1.0 in)
1959
42.9 mm (1.7 in)
1960
29.7 mm (1.2 in)
1961
33.6 mm (1.3 in)
1962
22.1 mm (0.9 in)
1963
20.6 mm (0.8 in)
1964
24.6 mm (1.0 in)
1965
37.9 mm (1.5 in)
1966
33.3 mm (1.3 in)
1967
26.5 mm (1.0 in)
1968
43.2 mm (1.7 in)
1969
61.6 mm (2.4 in)
1970
32.5 mm (1.3 in)
1971
24.6 mm (1.0 in)
1972
24.6 mm (1.0 in)
1973
17.8 mm (0.7 in)
1974
27.5 mm (1.1 in)
1975
15.6 mm (0.6 in)
1976
28.7 mm (1.1 in)
1977
23.5 mm (0.9 in)
1978
29.5 mm (1.2 in)
1979
26.7 mm (1.1 in)
1980
26.7 mm (1.1 in)
1981
49.3 mm (1.9 in)
1982
49.7 mm (2.0 in)
1983
34.9 mm (1.4 in)
1984
27.5 mm (1.1 in)
1985
24.4 mm (1.0 in)
1986
48.8 mm (1.9 in)
1987
23.8 mm (0.9 in)
1988
29.6 mm (1.2 in)
1989
30.4 mm (1.2 in)
1990
38.6 mm (1.5 in)
1991
37.1 mm (1.5 in)
1992
32.6 mm (1.3 in)
1993
30.8 mm (1.2 in)
1994
29.5 mm (1.2 in)
1995
43.4 mm (1.7 in)
1996
24.1 mm (0.9 in)
1997
44.9 mm (1.8 in)
1998
29.7 mm (1.2 in)
1999
54.9 mm (2.2 in)
2000
31.6 mm (1.2 in)
2001
41.2 mm (1.6 in)
2002
15.2 mm (0.6 in)
2003
39.6 mm (1.6 in)
2004
34.5 mm (1.4 in)
2005
27.7 mm (1.1 in)
2006
73.1 mm (2.9 in)
2007
47.0 mm (1.9 in)
2008
28.0 mm (1.1 in)
2009
26.7 mm (1.1 in)
2010
3.8 mm (0.15 in)
Longest dry spell (CDD)
The longest dry spell of the year at Blanca 4 NW, 1909 to 2010. The record is 106 days in 1966, marked on the chart; the median year is 46 days.
Longest dry spell (CDD) at Blanca 4 NW by year
Year
Longest dry spell (CDD)
1909
43 days
1910
72 days
1911
34 days
1912
64 days
1913
50 days
1914
70 days
1915
62 days
1916
77 days
1917
15 days
1925
32 days
1926
27 days
1927
22 days
1928
44 days
1929
89 days
1930
55 days
1943
21 days
1944
29 days
1945
69 days
1946
45 days
1947
27 days
1948
36 days
1949
51 days
1950
105 days
1951
65 days
1952
66 days
1953
44 days
1954
50 days
1955
105 days
1956
55 days
1957
42 days
1958
30 days
1959
29 days
1960
52 days
1961
31 days
1962
80 days
1963
64 days
1964
54 days
1965
52 days
1966
106 days
1967
46 days
1968
52 days
1969
37 days
1970
77 days
1971
48 days
1972
59 days
1973
39 days
1974
75 days
1975
57 days
1976
65 days
1977
30 days
1978
46 days
1979
39 days
1980
46 days
1981
58 days
1982
37 days
1983
30 days
1984
24 days
1985
24 days
1986
35 days
1987
28 days
1988
24 days
1989
49 days
1990
28 days
1991
49 days
1992
40 days
1993
22 days
1994
28 days
1995
59 days
1996
55 days
1997
44 days
1998
51 days
1999
62 days
2000
30 days
2001
36 days
2002
31 days
2003
32 days
2004
59 days
2005
28 days
2006
41 days
2007
32 days
2008
72 days
2009
60 days
2010
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
46 years with a frost
Across 46 years with a frost, the median last spring frost at Blanca 4 NW falls on 10 June and the median first autumn frost on 14 September, which leaves a median of 101 days between them.
Fitted over all years, the growing season changes by +3.4 days per decade at this station.
Frost dates and growing season at Blanca 4 NW
Measure
Median, all years
Earliest period
Recent period (1971 to 2009)
Recent against earliest
Fitted trend
Last spring frost
10 June
n/a
6 June
n/a
-1.6 days per decade
First autumn frost
14 September
n/a
17 September
n/a
+1.8 days per decade
Growing days
101 days
n/a
108 days
n/a
+3.4 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
66 years, 1909 to 2009
A day with at least 19.7 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 38.5 mm (1.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Blanca 4 NW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
19.7 mm (0.8 in)
5 years
25.1 mm (1.0 in)
10 years
28.5 mm (1.1 in)
25 years
32.6 mm (1.3 in)
50 years
35.6 mm (1.4 in)
100 years
38.5 mm (1.5 in)
Longer than the 66 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, 66 years of values from 1909 to 2009.
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: 37.3 mm (1.5 in) in 1997; 36.1 mm (1.4 in) in 2001; 34.8 mm (1.4 in) in 1909.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Blanca 4 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Blanca 4 NW 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.