Data Date: November

November 2024 – Very Warm and Dry Across Delaware

Posted on | by Dan Leathers

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 51.2°F, which is 3.7°F above the 1991-2020 mean value of 47.5°F (Figure 1).  November’s temperature was the 7th warmest since records began in 1895.  

November Precipitation

Delaware’s statewide precipitation for November 2024 averaged 1.96 inches, 1.31 inches below the 1991-2020 mean of 3.27 inches (Figure 2).  November’s precipitation totaled more than twice the amount that fell during September and October combined.  However, November 2024 still ranked in the bottom one-third for precipitation since 1895.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were uniformly positive across the State, with anomalies of 3° to 5°F across much of New Castle County (Figure 3). Precipitation anomalies were negative across the entire state, with Sussex County seeing the largest negative departures for the month (Figure 4).

National Anomalies

Temperatures were above normal across the entire eastern United States in November (Figure 5), with locations in the north-central and south-central U.S. seeing departures between 7° and 9°F.  Much of the western portions of the country saw below normal temperatures.  Precipitation was below normal along the Atlantic Coast (Figure 6), while much of the central U.S. and the Pacific coast saw higher than normal precipitation amounts.  The 500 hPa height pattern for November showed an anomalous jet stream ridge across the eastern United States and a trough in the west (Figure 7) contributing to the temperature anomalies across the country.

Global Anomalies

November 2024 ranked as the second warmest November on record for the globe since 1850.  Global temperatures were 2.41°F above the 1901-2000 mean.  Particular warmth was found across Asia which had its warmest November on record (Figure 8).

 

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November 2023 – Cool and Dry Across Delaware

Posted on | by Dan Leathers

November Temperatures
Preliminary data indicates that the statewide average temperature in November was 46.1° F, which is 1.4°F below the 1991-2020 mean value of 47.5° F (Figure 1).  November was only the 3rd month so far in 2023 with below normal temperatures.

November Precipitation
Delaware’s statewide precipitation for November 2023 averaged 2.50 inches, 0.77 inches below the 1991-2020 mean (Figure 2).  November was the 7th month of 2023 with below normal precipitation totals.

Statewide Spatial Anomalies
Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were generally negative across the entire state (Figure 3), except for the Wilmington metropolitan area where temperatures were near normal.  Precipitation anomalies were consistently negative across the entire state, with most stations seeing rainfall more than three inches below normal for the month (Figure 4).   

National Anomalies
Temperatures were above normal across most of the United States except for the Northeast corner of the country and southern Texas (Figure 5).  Precipitation was below normal across most of the eastern United States except for southern portions of Florida and Texas.  Dry conditions were also found along the Pacific Coast (Figure 6). The 500 hPa height pattern for November shows a jet stream trough over the northeastern United States contributing to the temperature anomalies across that region and the generally dry conditions across the eastern portions of the country (Figure 7).

 

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November 2022 – Warm with Near Normal Precipitation Across Delaware

Posted on | by Dan Leathers

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 50.3° F, which is 2.8° F above the 1991-2020 mean value of 47.5° F (Figure 1).  November 2022 was the 14th warmest November since observations began in 1895.

November Precipitation

Delaware’s statewide precipitation for November 2022 averaged 3.01 inches, 0.26 inches below the 1991-2020 mean (Figure 2).  This month’s precipitation was near the long-term average of values since 1895.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were uniformly positive across the state (Figure 3) with some stations seeing positive anomalies topping 4.0° F in northeastern New Castle County.  Precipitation observations were generally below normal in all areas except for a few stations that received significant localized precipitation (Figure 4).   

National Anomalies

Temperatures were above normal across most of the eastern one-third of the United States, with the largest positive anomalies found along the Atlantic Coast (Figure 5).  The western half of the country saw below normal temperatures, with the largest negative anomalies found across Montana.  Precipitation anomalies were very mixed across the country, with no coherent regions experiencing either dry or wet conditions (Figure 6) The 500 hPa height pattern for November shows a jet stream ridge over the eastern United States and a trough over the west contributing to the temperature anomalies across those regions  (Figure 7).

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Tree in Autumn

November 2021 – Below Normal Temperatures and Precipitation Across Delaware

Posted on | by Dan Leathers

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 45.6°F, which is 1.9°F below the 1991-2020 mean value of 47.5°F (Figure 1).  November’s average temperature was the first month with below normal temperatures since February of 2021. 

November Precipitation

Delaware’s statewide precipitation for November 2021 averaged 1.02 inches, 2.25 inches below the 1991-2020 mean (Figure 2).  This placed this month’s precipitation as the 13th lowest November precipitation since records began in 1895.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were uniformly below normal across the entire State, with many stations seeing negative temperature anomalies of between 2°F and 3°F (Figure 3).  Precipitation was below normal across the entire state with some stations reaching negative anomalies of greater than 4 inches (Figure 4).

National Anomalies

Temperatures were below normal across most of the eastern one-third of the United States, with the largest negative temperature anomalies found across the Ohio River Basin.  The western two-thirds of the United States saw significantly above normal temperatures, with some anomalies reaching as much as 7°F to 10°F above normal across the Rocky Mountain states (Figure 5).  Precipitation anomalies varied greatly across the country (Figure 6), with excessively dry conditions across much of the country except for Florida and the state of Washington.  The 500 hPa height pattern for November shows a strong jet stream trough located over eastern North America and a strong jet stream ridge over western North America contributing to the temperature extremes across those regions (Figure 7).

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Wet droplets of rain on green leaves

November 2020 – Exceptionally Warm and Wet Across Delaware

Posted on | by Dan Leathers

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 52.1o F, which is 4.5o F above the 1981-2010 mean value of 47.6o F (Figure 1).  November 2020 was the 2nd  warmest November since observations began in 1895.  Only November of 1985 has been warmer.

November Precipitation

Delaware’s statewide precipitation for November 2020 averaged 5.77 inches, 2.37 inches above the 1981-2010 mean (Figure 2).  This placed this month’s precipitation total as the 8th highest of all months since 1895. 

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were positive at all stations, with the largest anomalies found across Kent and New Castle Counties reaching to approximately 6o F at some stations (Figure 3).  Precipitation was above normal throughout the State, with departures of greater than four inches common across many areas (Figure 4). 

National Anomalies

Temperatures were above normal across nearly the entire United States, with the largest temperature anomalies (5o F – 10o F) found across the north-central portion of the country (Figure 5).  Precipitation anomalies varied greatly across the country with particularly heavy rainfall along the Atlantic coast from Florida to Delaware (Figure 6).  The 500 hPa height pattern for November shows a jet stream ridge covering the eastern two-thirds of the United States (Figure 7).  The placement of the jet stream north of its normal position is responsible for the warm temperatures seen across the country. 

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November 2019 – Cold and Dry Across Delaware

Posted on | by Dan Leathers

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 43.6°F, which is 4.0°F below the 1981-2010 mean value of 47.6°F (Figure 1). This places November 2019 as the 22nd coldest since records began in 1895.

November Precipitation

Delaware’s statewide precipitation for November 2019 averaged only 1.46 inches, 1.94 inches below the 1981-2010 mean (Figure 2). This placed the November 2019 precipitation amount in the bottom one-third of months since 1895.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were uniformly below normal throughout the State (Figure 3), with the largest negative anomalies reaching values greater than -6°F. Precipitation was below normal at all stations across the State (Figure 4), with several stations in Kent County recording anomalies of greater than 2” below the long-term mean value.

National Anomalies

Temperatures were below normal throughout the eastern portion of the U.S, where some negative anomalies reached greater than 7°F (Figure 5). The western one-third of the U.S. saw above normal temperatures for the month, with parts of the Pacific Coast recording temperatures more than 5°F above normal. Precipitation varied greatly across the U.S. with very dry conditions across the Pacific Northwest and very wet conditions across the southwestern portion of the country (Figure 6). The 500 hPa height pattern for November showed a strong trough dominating the eastern U.S. (Figure 7), bringing the cold and dry conditions to our region.

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Icicles form on cast iron

November 2018: Record Precipitation and Cold Conditions Across Delaware

Posted on | by Dan Leathers

 

 

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 46.2°F, which is 1.4°F below the 1981-2010 mean value of 47.6°F (Figure 1). Our cold November followed extreme warmth seen during September and October, making for an abrupt transition into the “winter” season for the First State.

November Precipitation

Delaware’s statewide precipitation for November 2018 averaged 7.28 inches, 3.88 inches above the 1981-2010 mean (Figure 2). November 2018 was the wettest since records began in 1895. Moreover, the year-to-date precipitation for the State, through the end of November, is also the highest year-to-date precipitation since 1895. An early season snowfall event brought early school closings and hazardous travel to Delaware on the 15th, when three inches of snow fell across the northern portions of the State.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were negative throughout the State (Figure 3), with the largest negative departures found across New Castle County. Heavy precipitation fell across the entire state, with the largest positive precipitation departures seen across northern Delaware, where some reached values of greater than six inches above normal (Figure 4).

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Berries grow from the branches of a plants

November Climate Conditions – Dry with Near Normal Temperatures Across Delaware

Posted on | by Dan Leathers
 
 

 

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 47.5°F, which is the normal value for the month (Figure 1).

November Precipitation

Delaware’s statewide precipitation for November 2017 averaged 2.01 inches, 1.39 inches below the 1981-2010 mean (Figure 2), placing it in the driest one-third of Novembers since 1895.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures varied depending upon location across the State, with no departures exceeding 3°F (Figure 3). Precipitation departures were below normal at each station (Figure 4), with the driest conditions found across northern Delaware and Chester County, PA.

 

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Golden sky, dark clouds, and rain

Very Warm, and Moist Conditions Characterize the 2016 Autumn Season Across Delaware

Posted on | by Dan Leathers

 

 

Autumn Temperatures

Preliminary data indicates that temperatures were significantly above the 30-year normal during the autumn season. The statewide mean autumn temperature of 60.3°F was 2.7°F above the 1981-2010 mean value of 57.6°F (Figure 1). Autumn 2016 was tied with the 2005 season as the 2nd warmest autumn since records began in 1895.

Autumn Precipitation

The statewide mean precipitation of 13.23 inches was 2.40 inches above the 1981-2010 normal of 10.83 inches (Figure 2). However, much of the autumn total fell during September, when 9.43 inches of precipitation fell across the State, the 3rd wettest September total on record.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) show that autumn temperatures were much above normal across northern New Castle County and Chester County, PA, along with southern portions of Kent and northern Sussex counties (Figure 3).

Autumn precipitation varied appreciably across the State depending upon location. Very dry conditions were especially apparent across extreme northern Delaware and Chester County, PA (Figure 4), while southern Delaware saw much above normal precipitation during the autumn Season.

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Fall leaves in sunlight

November 2016: Very Dry & Warm Conditions

Posted on | by Dan Leathers
 

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 48.7°F, 1.1°F above the 1981-2010 normal of 47.6°F (Figure 1). November was the fifth month in a row with temperatures appreciably above normal across the First State.

November Precipitation

Delaware’s statewide precipitation for November 2016 averaged 0.91 inches, 2.49 inches below the 1981-2010 mean of 3.40 inches (Figure 2). November 2016 was the 8th driest November since records began in 1895.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) shows that temperatures were well above normal across extreme northern Delaware and Chester County, PA during November (Figure 3). Temperatures were well above normal across inland Sussex County as well. Much below normal rainfall was the rule across southern Delaware, with smaller rainfall deficits found in northern Delaware and Chester County, PA (Figure 4).

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