Climate Comfort Score
62/100
Good
2026 data Public-data reference. official source
Islip LI Macarthur, NY Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 1 weather station (1991-2020).
Islip LI Macarthur, New York has an average annual temperature of 53°F and a climate comfort score of 62/100 (Good). Annual precipitation totals 46.0", including 31.8" of snow. Based on NOAA 30-year normals (1991–2020).
Avg Temperature
53°F (12°C)
Avg High
61°F
Avg Low
45°F
Annual Precip
46.0"
Annual Snow
31.8"
Comfort Score
62/100
Good
Avg Annual Temperature
53°F
30-year mean (NOAA NCEI)
Annual Precipitation
46.0"
Plus 31.8" of snow
Comfort score vs national 100-point ceiling (Islip LI Macarthur) 62.0%
National median (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Islip LI Macarthur area.
Warming context for Islip LI Macarthur
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Islip LI Macarthur captures average conditions across the spread shown — the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 39°F (4°C) | 25°F (-4°C) | 32°F (0°C) | 3.7" | 10.3" | 24.8 | 0.0 |
| February | 41°F (5°C) | 26°F (-4°C) | 33°F (1°C) | 3.3" | 9.4" | 22.3 | 0.0 |
| March | 48°F (9°C) | 32°F (0°C) | 40°F (4°C) | 4.5" | 6.5" | 16.9 | 0.0 |
| April | 58°F (15°C) | 41°F (5°C) | 50°F (10°C) | 4.1" | 0.6" | 3.3 | 0.0 |
| May | 68°F (20°C) | 51°F (10°C) | 60°F (15°C) | 3.3" | 0.0" | 0.0 | 0.3 |
| June | 77°F (25°C) | 61°F (16°C) | 69°F (21°C) | 4.0" | 0.0" | 0.0 | 1.5 |
| July | 83°F (28°C) | 67°F (20°C) | 75°F (24°C) | 3.3" | 0.0" | 0.0 | 4.1 |
| August | 81°F (27°C) | 66°F (19°C) | 74°F (23°C) | 4.2" | 0.0" | 0.0 | 2.2 |
| September | 75°F (24°C) | 59°F (15°C) | 67°F (19°C) | 3.6" | 0.0" | 0.0 | 0.2 |
| October | 64°F (18°C) | 47°F (8°C) | 56°F (13°C) | 4.0" | 0.0" | 0.8 | 0.0 |
| November | 54°F (12°C) | 38°F (3°C) | 46°F (8°C) | 3.4" | 0.5" | 9.3 | 0.0 |
| December | 44°F (7°C) | 30°F (-1°C) | 37°F (3°C) | 4.7" | 4.5" | 20.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 3.7"
Snow: 10.3"
11.1 days with precipitation
February 3.3"
Snow: 9.4"
9.9 days with precipitation
March 4.5"
Snow: 6.5"
10.8 days with precipitation
April 4.1"
Snow: 0.6"
11.3 days with precipitation
May 3.3"
11.6 days with precipitation
June 4.0"
10.1 days with precipitation
July 3.3"
9.1 days with precipitation
August 4.2"
8.9 days with precipitation
September 3.6"
8.6 days with precipitation
October 4.0"
9.2 days with precipitation
November 3.4"
Snow: 0.5"
9.6 days with precipitation
December 4.7"
Snow: 4.5"
11.8 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 2
50% probability date
Last Spring Freeze
April 10
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,183
Higher = more heating needed
Cooling Degree Days
885
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Related Data
PlainEnviro
EPA environmental data — pollution, water quality, and environmental health by location
PlainCarbon
Carbon emissions data — greenhouse gas reporting and facility-level CO2 data
PlainHazard
Natural disaster data — weather-related hazards, FEMA declarations, and risk profiles
PlainAirData
EPA air quality data — AQI readings, pollutant levels, and air quality trends
Climate Guides
Climate Insight: Islip LI Macarthur, NY
The NOAA 1991–2020 climate normals describe Islip LI Macarthur, New York as a location with an annual average temperature of 53°F, ranging from a mean daily high of 61°F to a mean daily low of 45°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USW00004781, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Islip LI Macarthur receives roughly 46.0 inches of precipitation each year, with 31.8 inches typically falling as snow. Growing-season length varies with elevation and microclimate, with the last spring freeze near April 10 and the first fall freeze near November 2. For energy use, 5,183 heating degree days and 885 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Islip LI Macarthur scores 62/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows — shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Islip LI Macarthur, NY? ▼
The average annual temperature in Islip LI Macarthur, New York is 53°F. The warmest month averages 83°F (28°C) and the coldest averages 25°F (-4°C).
How much rain does Islip LI Macarthur get? ▼
Islip LI Macarthur receives 46.0 inches of precipitation annually, including 31.8 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Islip LI Macarthur? ▼
Islip LI Macarthur has a climate comfort score of 62/100 (Good). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
When is the growing season in Islip LI Macarthur? ▼
Growing season data is not available for Islip LI Macarthur.
How much energy does heating and cooling require in Islip LI Macarthur? ▼
Islip LI Macarthur has 5,183 heating degree days and 885 cooling degree days annually. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this Islip LI Macarthur climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from weather station USW00004781. These 30-year averages are the standard reference for typical weather conditions.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00004781. For informational purposes only.
Read our methodology — how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
