Ashrae Weather Data Viewer Free

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ASHRAE climatic design conditions station finder. ASHRAE CLIMATIC DESIGN CONDITIONS 2009/2013/2017. Weather Data Viewer, Version 4.0 American Society of Heating Refrigerating and Air-Conditioning Engineers on Amazon.com.FREE. shipping on qualifying offers. Displays climatic design conditions, frequency distributions, joint frequency tables, and summary statistics for dry-bulb.

Ashrae
Ashrae Weather Data Viewer Free Online

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Why We Care About Weather

appropriate design
accounting for the future
accounting for urban environments
peak load design and resiliency

Types of weather files

Design Days (.ddy)
TMY,TMY2,TMY3 (.epw)
TMY3,TMY5,TMY7,TMY10 (.epw)
XMY (.epw)
AMY (.epw)

Ashrae

Design Day Weather

ASHRAE 2013 Design Conditions Definitions in E+ format: Annual, Monthly
ASHRAE 2009 Design Data .ddy files are distributed with TMY3 data for that location, if available.

Future weather files

Climate change is moving fast enough that TMY3 datasets will no longer be valid for loads or energy modeling several decades out.Future weather is predicted by using a global circulation model (GCM) at fine resolution, and simulating future weather.

There are two ways to generate: (1) morphing and (2) probabilistic generation from climate model.

($) WeatherShift Generates future weather files for 250 cities at 2020, 2050, and 2080, and will soon have design days as well. It makes these files from the TMY3 file by a scaling factor derived from 14 GCM models running the RCP 8.5 scenario of the IPCC.
(Free) CCWorldWeatherGen The climate change world weather file generator (CCWorldWeatherGen) allows you to generate climate change weather files for world-wide locations ready for use in building performance simulation programs.
(Free, Data only*) NARCCAP Future weather data for different climate scenarios. Need to translate into .epw format.
From ASHRAE HOF 2013:
- The results, averaged over all locations,are as follows:
  - The 99.6% annual dry-bulb temperature increased 2.74°F
  - The 0.4% annual dry-bulb increased 1.42°F
  - Annual dew point increased by 0.99°F
  - Heating degree-days (base 65°F) decreased by 427°F-days
  - Cooling degree-days (base 50°F) increased by 245°F-days

Urban climate weather adjustments

(Free) Urban weather generator. Also available on Github.(requires Matlab)

Weather File Sources

epwmap, a nice version of official DOE website EnergyPlus Weather Data
(Free) OneBuilding.org
(Free) Localized Actual Meteorological Year Files
($) Weather Analytics - sells AMY, TMY3, TMY5, TMY7, TMY10 and XMY data (must purchase through IES-VE). Location specific; does not have to be a commercial weather station location.
($) White Box Technologies
($) Weather Source
($) WeatherShift - get future weather data
($) California Climate zone weather is available in the T24 data distributed with CBECC-COM.
(Free/$) WeatherUnderground has historical weather data going back several years for many stations. There is an API which is free for 500 API calls per day with a max of 10 per minute. You can make your own script to fetch data, see: this stackexchange post for an example.

Weather Analysis Tools

(Free) epwvis Visualization and analysis tool for .epw files.
(Free) epwvis-compare epwvis, but compares weather files.
(Free) WeatherSpark - Wonderful site for weather. (*current graphics are now discontinued. Died a slow death from unsupported flash libraries ) But the historical tab for locations has very nice graphical and textual summaries of climate.
(Free) Ladybug Ladybug is a free and open source environmental plugin for Grasshopper to help designers create an environmentally-conscious architectural design. The first step is weather data analysis.
(Free) Dragonfly Warp climate files based on either satellite data, urban morphology parameters, or future climate change scenarios.
(Free) DView A tool that can view and run basic statistics on weather files. Developed by NREL as part of BeOpt library.
(Free) ClimateConsultant - standalone software for generating many design options for weather files. Architects seem to really like the design strategies overlay on the psychrometric chart.
(Free) Elements Elements is a free, open-source, cross-platform software tool for creating and editing custom weather files for building energy modeling.
(Free) klimmat - pdf report based on .epw weather files across the globe.
(Free) DegreeDays - online tool for generating heating and cooling degree days. Only goes back 36 months for monthly data. If you want to go back farther, go to the source:
(Free) Weather Underground - Despite the name, this site has lots of above-ground weather data for lots of hyper-local locations, extending back for as long as a station has existed. Good visualizations too.
(Free) LMNts architects parallel coordinates for analyzing components of weather data.
(Free) ODS Wind Rose Generates wind roses from an .epw file and generates a downloadable .pdf report.
($) Climate Tool Lots of cool tools for climate analysis, similar to ClimateConsultant, but with some more features. Calculate potential for heating/cooling strategies, including: natural ventilation, night cooling, evaporative cooling, passive solar heating, and passive solar cooling.
($) IES excel macro

Types of Weather Analysis / Graphics

line chart
heat map
psychrometric chart
area plot (cold, comfortable)
solar stereogram
windrose
Mahoney analysis
universal thermal comfort index (UTCI)
thermal autonomy

Relevant reports

Drury B. Crawley. 1998. 'Which Weather Data Should You Use for Energy Simulations of Commercial Buildings?' in ASHRAE Transactions, pp. 498-515, Vol. 104, Pt. 2. Atlanta: ASHRAE.
ASHRAE HOF Chp.14 Climatic Design Information.
Wilcox, S., and W. Marion. 2008. Users manual for TMY3 data sets. Technical Report NREL/TP-581-43156. National Renewable Energy Laboratory,Golden, CO. Available at http://www.nrel.gov/docs/fy08osti/43156.pdf.
NREL. 2011. National solar radiation database, 1991-2010 update: User’s manual. Technical Report NREL/TP-581-41364. National Renewable Energy Laboratory, Golden, CO. Available at http:// rredc.nrel.gov/solar/old_data/nsrdb/1991-2010/.

Relevant Unmet Hours posts

Relevant code resources:

pyepw - python script for parsing EPW files
ladybug parser - script that processes epw files in python for Ladybug
empsy - make your own weather files by simulating the world!
epwvis - javascript for parsing EPW files

Ongoing weather research

ASHRAE 1561-RP 'PROCEDURES TO ADJUST OBSERVED CLIMATIC DATA FOR REGIONAL OR MESOSCALE CLIMATIC VARIATIONS'
ASHRAE 1699-RP 'UPDATE CLIMATIC DESIGN DATA IN CHAPTER 14 OF THE 2017 HANDBOOK OF FUNDAMENTALS'

Process for weather data

Always plot it to make sure the data is clean. There are some known issues with TMY3 files, e.g. Minneapolis
Pick most recent weather, and then nearest location
Be cautious if simulation weather is more extreme than design days - you may get unmet hours / undersized equipment
Get annual .ddy files, and include other months for cooling