Westminster Weather Records (USC00189440)

Record envelope, standing records and threshold days for Westminster (USC00189440), Maryland, United States, with 35 years of record.

Key Facts for Westminster

Westminster (USC00189440) is a weather station in Maryland, United States at 39.57 latitude and -76.99 longitude, 229 m (750 ft) above sea level.
The station reports from 1979 to 2013, 35 years of record.
1,464 records set at Westminster still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Maryland, United States, 39.57 latitude, -76.99 longitude.
Elevation: 229 m (750 ft).
Period of record: 1979 to 2013, 35 years.
Eligible elements: none yet.

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 Westminster. 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 Westminster, 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)	-25.0 C (-13.0 F)	n/a	n/a
Feb	24.4 C (75.9 F)	-20.0 C (-4.0 F)	n/a	n/a
Mar	30.6 C (87.1 F)	-20.0 C (-4.0 F)	n/a	n/a
Apr	32.8 C (91.0 F)	-8.9 C (16.0 F)	n/a	n/a
May	34.4 C (93.9 F)	-2.2 C (28.0 F)	n/a	n/a
Jun	37.2 C (99.0 F)	1.1 C (34.0 F)	n/a	n/a
Jul	39.4 C (102.9 F)	4.4 C (39.9 F)	n/a	n/a
Aug	38.3 C (100.9 F)	6.1 C (43.0 F)	n/a	n/a
Sep	35.6 C (96.1 F)	-0.6 C (30.9 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-4.4 C (24.1 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-10.0 C (14.0 F)	n/a	n/a
Dec	23.9 C (75.0 F)	-20.6 C (-5.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Westminster still stand. 1989 holds the most, with 101.

Standing records at Westminster by the year they were set
Year set	Standing records
1979	43
1980	56
1981	57
1982	69
1983	78
1984	86
1985	63
1986	67
1987	50
1988	92
1989	101
1990	89
1991	96
1992	48
1993	55
1994	54
1995	56
1996	81
1997	47
1998	64
1999	17
2011	35
2012	33
2013	27

Wettest Day of Each Month

Sep: 145.3 mm (5.7 in)

The wettest day on record for each calendar month at Westminster. The most was 145.3 mm (5.7 in) on 6 September 1979.

Record daily precipitation for each month at Westminster
Month	Record daily precipitation (mm)	Date
Jan	88.4 mm (3.5 in)	31 January 2013
Feb	42.7 mm (1.7 in)	3 February 1982
Mar	62.2 mm (2.4 in)	3 March 1994
Apr	63.2 mm (2.5 in)	29 April 2011
May	73.7 mm (2.9 in)	6 May 1989
Jun	64.8 mm (2.6 in)	1 June 1993
Jul	83.1 mm (3.3 in)	20 July 2012
Aug	134.9 mm (5.3 in)	20 August 1991
Sep	145.3 mm (5.7 in)	6 September 1979
Oct	94.0 mm (3.7 in)	1 October 1979
Nov	94.0 mm (3.7 in)	28 November 1993
Dec	100.3 mm (3.9 in)	5 December 1993

Period of Record Coverage

1979 to 2013

24 years of record at Westminster, 1979 to 2013. 6 years have data for under 90 percent of days and are left out of rankings: 1979, 1985, 1999, 2011, 2012, 2013.

Days with data per year at Westminster
Year	Days with data	Share of year	Complete
1979	153	42%	No
1980	363	99%	Yes
1981	360	99%	Yes
1982	363	99%	Yes
1983	360	99%	Yes
1984	360	98%	Yes
1985	324	89%	No
1986	365	100%	Yes
1987	359	98%	Yes
1988	361	99%	Yes
1989	357	98%	Yes
1990	356	98%	Yes
1991	357	98%	Yes
1992	362	99%	Yes
1993	356	98%	Yes
1994	359	98%	Yes
1995	353	97%	Yes
1996	359	98%	Yes
1997	352	96%	Yes
1998	350	96%	Yes
1999	75	21%	No
2011	295	81%	No
2012	242	66%	No
2013	119	33%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

17 complete years, 1980 to 1998

One stripe for each of 17 complete years at Westminster, 1980 to 1998. Blue stripes are years cooler than the station's own mean of 12.4 C (54.3 F); red stripes are warmer. The coolest year was 1989, at 11.0 C (51.8 F), and the warmest was 1991, at 14.2 C (57.5 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Westminster as warming stripes, 1980 to 1998
Year	Annual mean temperature	Difference from the station mean
1980	12.1 C	-0.26 C
1981	11.9 C	-0.47 C
1982	12.2 C	-0.16 C
1983	12.5 C	+0.12 C
1984	12.5 C	+0.16 C
1987	12.7 C	+0.30 C
1988	11.6 C	-0.74 C
1989	11.0 C	-1.36 C
1990	13.8 C	+1.40 C
1991	14.2 C	+1.78 C
1992	12.3 C	-0.12 C
1993	12.5 C	+0.13 C
1994	12.8 C	+0.42 C
1995	11.7 C	-0.70 C
1996	11.1 C	-1.26 C
1997	11.9 C	-0.49 C
1998	13.7 C	+1.31 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1979 to 2013

Yearly extremes at Westminster: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	1988	36.1 C (97.0 F)	24
Coldest night (TNn)	-25.0 C (-13.0 F)	1994	-16.7 C (1.9 F)	24
Wettest day (Rx1day)	145.3 mm (5.7 in)	1979	66.2 mm (2.6 in)	24
Wettest five days (Rx5day)	173.5 mm (6.8 in)	1979	86.7 mm (3.4 in)	24
Longest dry spell (CDD)	29 days	1988	16 days	24

Hottest day (TXx)

The hottest day of the year at Westminster, 1979 to 2013. The record is 39.4 C (102.9 F) in 1988, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Westminster by year
Year	Hottest day (TXx)
1979	33.3 C (91.9 F)
1980	37.2 C (99.0 F)
1981	36.7 C (98.1 F)
1982	35.6 C (96.1 F)
1983	38.3 C (100.9 F)
1984	36.7 C (98.1 F)
1985	35.0 C (95.0 F)
1986	35.6 C (96.1 F)
1987	36.1 C (97.0 F)
1988	39.4 C (102.9 F)
1989	35.6 C (96.1 F)
1990	36.1 C (97.0 F)
1991	38.3 C (100.9 F)
1992	35.6 C (96.1 F)
1993	36.1 C (97.0 F)
1994	36.7 C (98.1 F)
1995	37.2 C (99.0 F)
1996	35.6 C (96.1 F)
1997	37.2 C (99.0 F)
1998	33.9 C (93.0 F)
1999	22.8 C (73.0 F)
2011	38.9 C (102.0 F)
2012	37.2 C (99.0 F)
2013	33.3 C (91.9 F)

Coldest night (TNn)

The coldest night of the year at Westminster, 1979 to 2013. The record is -25.0 C (-13.0 F) in 1994, marked on the chart; the median year is -16.7 C (1.9 F).

Coldest night (TNn) at Westminster by year
Year	Coldest night (TNn)
1979	-9.4 C (15.1 F)
1980	-16.7 C (1.9 F)
1981	-17.8 C (0.0 F)
1982	-23.9 C (-11.0 F)
1983	-20.6 C (-5.1 F)
1984	-18.3 C (-0.9 F)
1985	-23.9 C (-11.0 F)
1986	-15.0 C (5.0 F)
1987	-16.7 C (1.9 F)
1988	-16.7 C (1.9 F)
1989	-18.3 C (-0.9 F)
1990	-14.4 C (6.1 F)
1991	-11.7 C (10.9 F)
1992	-16.1 C (3.0 F)
1993	-14.4 C (6.1 F)
1994	-25.0 C (-13.0 F)
1995	-20.0 C (-4.0 F)
1996	-20.0 C (-4.0 F)
1997	-20.6 C (-5.1 F)
1998	-12.8 C (9.0 F)
1999	-13.3 C (8.1 F)
2011	-15.0 C (5.0 F)
2012	-7.8 C (18.0 F)
2013	-13.3 C (8.1 F)

Wettest day (Rx1day)

The wettest day of the year at Westminster, 1979 to 2013. The record is 145.3 mm (5.7 in) in 1979, marked on the chart; the median year is 66.2 mm (2.6 in).

Wettest day (Rx1day) at Westminster by year
Year	Wettest day (Rx1day)
1979	145.3 mm (5.7 in)
1980	71.1 mm (2.8 in)
1981	58.4 mm (2.3 in)
1982	48.3 mm (1.9 in)
1983	65.3 mm (2.6 in)
1984	83.6 mm (3.3 in)
1985	72.6 mm (2.9 in)
1986	59.7 mm (2.4 in)
1987	90.2 mm (3.6 in)
1988	45.7 mm (1.8 in)
1989	73.7 mm (2.9 in)
1990	47.0 mm (1.9 in)
1991	134.9 mm (5.3 in)
1992	37.6 mm (1.5 in)
1993	100.3 mm (3.9 in)
1994	64.0 mm (2.5 in)
1995	56.1 mm (2.2 in)
1996	59.7 mm (2.4 in)
1997	39.9 mm (1.6 in)
1998	67.1 mm (2.6 in)
1999	36.3 mm (1.4 in)
2011	81.8 mm (3.2 in)
2012	83.1 mm (3.3 in)
2013	88.4 mm (3.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Westminster, 1979 to 2013. The record is 173.5 mm (6.8 in) in 1979, marked on the chart; the median year is 86.7 mm (3.4 in).

Wettest five days (Rx5day) at Westminster by year
Year	Wettest five days (Rx5day)
1979	173.5 mm (6.8 in)
1980	77.2 mm (3.0 in)
1981	73.4 mm (2.9 in)
1982	79.3 mm (3.1 in)
1983	88.7 mm (3.5 in)
1984	93.0 mm (3.7 in)
1985	76.4 mm (3.0 in)
1986	71.4 mm (2.8 in)
1987	124.2 mm (4.9 in)
1988	70.2 mm (2.8 in)
1989	115.9 mm (4.6 in)
1990	80.8 mm (3.2 in)
1991	139.9 mm (5.5 in)
1992	73.4 mm (2.9 in)
1993	113.3 mm (4.5 in)
1994	86.6 mm (3.4 in)
1995	107.5 mm (4.2 in)
1996	86.7 mm (3.4 in)
1997	71.4 mm (2.8 in)
1998	96.2 mm (3.8 in)
1999	40.2 mm (1.6 in)
2011	169.6 mm (6.7 in)
2012	106.4 mm (4.2 in)
2013	38.1 mm (1.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Westminster, 1979 to 2013. The record is 29 days in 1988, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Westminster by year
Year	Longest dry spell (CDD)
1979	11 days
1980	15 days
1981	22 days
1982	16 days
1983	17 days
1984	14 days
1985	13 days
1986	21 days
1987	23 days
1988	29 days
1989	16 days
1990	13 days
1991	15 days
1992	16 days
1993	17 days
1994	20 days
1995	22 days
1996	13 days
1997	18 days
1998	19 days
1999	10 days
2011	13 days
2012	16 days
2013	4 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.

Download the Data

Data for Westminster standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Westminster 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.

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