Climate Comfort Score
63/100
Good
NOAA 1991–2020 normals 53°F annual avg Public-domain federal data
Islip LI Macarthur, NY Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 53°F
- Avg annual temp
- 63/100
- Comfort score
- 46.0"
- Annual precip
- 206d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Islip LI Macarthur
Islip LI Macarthur, New York averages 53°F a year and scores 63/100 on the comfort index - good, milder than 47% of U.S. cities.
- 53°F
- yearly average temperature, NOAA normal
- 63/100
- comfort score, milder than 47% of U.S. cities
- 46.0"
- annual precipitation · 32" snow
- 206 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
53°F (12°C)
Avg High
61°F
Avg Low
45°F
Annual Precip
46.0"
Annual Snow
31.8"
Comfort Score
63/100
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) 63.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Islip LI Macarthur area.
How Islip LI Macarthur compares to every U.S. city
Islip LI Macarthur's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
63 Top 53% higher than 47% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Islip LI Macarthur
MethodologySince 1900, U.S. land temperatures have tracked (and diverged from) the global mean - the chart below shows how. Islip LI Macarthur's current NOAA 1991-2020 normal sits within that longer spread, and the most recent decade runs 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
Growing Season
206 days
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
What Islip LI Macarthur's climate means for you
Islip LI Macarthur runs 53°F a year - peaking in July, coldest in January.
- Gardeners get about 206 frost-free days, with the last spring freeze near April 10 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,183 heating and 885 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Islip LI Macarthur, NY
Islip LI Macarthur, New York runs an annual average of 53°F, ranging from a mean daily high of 61°F to a mean daily low of 45°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USW00004781, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
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. The frost-free season averages 206 days, which directly shapes the planting calendar and growing potential for the area, 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 63/100 (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 63/100 (Good), milder than 47% of U.S. cities in the PlainClimate database.
When is the growing season in Islip LI Macarthur? ▼
Islip LI Macarthur has approximately 206 frost-free days per year, with the last spring freeze around April 10 and the first fall freeze around November 2.
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, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Islip LI Macarthur climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00004781 near Islip LI Macarthur.
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
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.