Find, Interpret and Export NOAA SSOD Daily Summaries

Use the SSOD Explorer step by step: find a station, select a UTC-day period, inspect completeness and limitations, and export NOAA daily summaries to Excel.
Author

Climate Explorer Team

Modified

August 27, 2026

Open the SSOD Explorer

Wide SSOD Explorer map view with the Central Park station selected in red, nearby stations shown in blue, and country, station, and date controls in the sidebar.

SSOD Explorer map showing the selected Central Park station and nearby stations in the New York area.

Quick start

  1. Open the Explorer and use Select Country or Find Station to narrow the catalog.
  2. Set a date range of no more than 1,096 days, then click a map point or double-click a station-table row.
  3. In Dashboard, check the station ID, selected period, and parameter-weighted coverage.
  4. Compare the plots with the underlying rows in Data; blanks mean unavailable values, not zero.
  5. Choose Export Data to download the selected station and period as an Excel (.xlsx) workbook.

1. Know what SSOD represents

The Synoptic Summary of the Day version 2 (SSODv2) is a NOAA/NCEI product derived from hourly and synoptic reports in GHCN-Hourly. Climate Explorer provides an independent interface; it does not produce the source summaries and is not affiliated with NOAA.

Each SSOD date covers the same global synoptic day, 00:00–23:59 UTC. It is therefore useful for consistently aligned station comparisons, but it may span parts of two local calendar dates. If your question concerns a local-date record, rainfall total, or temperature extreme, first read what an SSOD date means across time zones.

NOAA’s SSODv2 product page and technical documentation are authoritative for source definitions and limitations.

2. Find the right station

The left sidebar controls the station and date selection:

  • Select Country filters the catalog by one or more countries. Leave it empty to retain the worldwide inventory.
  • Find Station searches for a station name or identifier within the active filters.
  • Select Date Range sets the period used by station availability, plots, the Data table, and data export. The current application accepts a maximum span of 1,096 days.
  • Download Stations (Excel) exports metadata for stations currently visible in the map extent; it does not export their daily observations.

The count at the bottom of the sidebar reports how many stations match the current view. It is a live interface count, not a fixed statement about the complete NOAA archive.

Map View

Use the map to discover stations geographically. Blue points are available stations; the selected point is highlighted. Click a point to load it into the Dashboard. Map proximity alone does not establish that two stations share the same exposure, observing history, or climate.

Stations Info

Wide SSOD Explorer Stations Info view with a searchable station table and columns for station ID, station name, country, start year, end year, elevation, and state or province.

The SSOD Stations Info table showing identifiers, names, countries, record years, elevation, and state or province fields.

Use Stations Info when names are ambiguous or you need to compare identifiers and record periods. Search the table, then double-click the desired row to load its data and open the Dashboard. Always record the displayed station ID; similar names do not prove that records come from the same observing site.

3. Set a defensible date window

Choose the shortest period that answers the question. A short event window makes missing days and abrupt changes easier to see, while a longer period provides context but can hide isolated gaps.

The application may shorten an unsupported range to its 1,096-day limit. After changing dates, confirm the Viewing interval in the Dashboard header rather than assuming the requested endpoints were retained. Station availability and variable availability can also differ: a station may exist in the catalog but lack a requested field or date.

4. Read the Dashboard

Wide SSOD Dashboard view for station USW00094728 at Central Park, showing its metadata and multi-year temperature, dew-point, wind, and pressure plots.

The SSOD Dashboard Plots view for Central Park with readable temperature, dew-point, wind, and pressure time series.

Before interpreting a plot, check the header:

  • Station gives the name and NOAA station identifier.
  • Location gives the country and coordinates supplied by the application.
  • Technical gives elevation and the source reporting frequency.
  • Station Availability shows the broader record period, the interval currently viewed, and parameter-weighted coverage for that view.

The Plots tab summarizes the selected period visually. Use it to identify sequences, gaps, possible extremes, or comparisons worth checking—not as the sole evidence for an exact value.

Check the Data rows before exporting

SSOD Dashboard Data tab after loading, with Excel export, units in the table headers, and populated Central Park daily rows including temperature, visibility, pressure, and precipitation values.

The loaded SSOD Data table for Central Park showing its variable headers, daily rows, and Export Data control.

Open Data to inspect exact displayed rows and units. The table is sortable. Export Data downloads the parsed daily record for the selected station and period as an Excel (.xlsx) workbook; the current interface does not label this control as a CSV export.

5. Parameter and interpretation reference

SSOD fields displayed in the Climate Explorer Data tab
Displayed field Meaning in the Explorer Unit Interpretation check
Date SSOD summary date YYYY-MM-DD Covers 00:00–23:59 UTC, not automatically a local day
Avg Temperature Mean of contributing temperature reports °C Examine report counts and gaps before comparing means
Max Temperature Highest temperature represented in the summary °C NOAA cautions this may not be the true daily extreme
Min Temperature Lowest temperature represented in the summary °C NOAA cautions this may not be the true daily extreme
Max Wind Speed Maximum displayed wind speed m/s Do not confuse sustained wind with a gust field
Avg Visibility Mean of contributing visibility reports km Availability and sampling vary by station and day
Avg Pressure Mean displayed sea-level pressure hPa Confirm the field definition before mixing with station pressure
Total Precipitation Reported precipitation for the synoptic day mm NOAA warns synoptic messages can underreport precipitation

SSOD source files contain more fields than this compact interface table, including measurement counts, dew point, station pressure, gust, snow depth, and weather indicators where reports support them. Use the NOAA documentation when an analysis requires a field not displayed here.

6. Check completeness and quality

Daily means have a documented minimum

For a daily mean, NOAA requires at least one report in each of four six-hour blocks: 00–05, 06–11, 12–17, and 18–23 UTC. That rule supports temporal coverage across the UTC day, but it does not make every variable or every extreme complete.

Counts are context, not certification

Measurement-count fields indicate how many reports contributed to a summary. A higher count can provide useful context, but it does not prove that a maximum, minimum, or precipitation total captured every relevant observation.

Understand Climate Explorer screening

The application masks values outside broad physical bounds and applies simple relational checks, such as maximum temperature not being lower than minimum temperature. These are interface-level screening safeguards, not replacements for NOAA or national meteorological service quality control.

Treat missing values correctly

A blank cell or broken plot segment means the displayed value is unavailable. Do not replace it with zero unless the upstream field definition explicitly supports that treatment. In particular, blank precipitation is not evidence of a dry day.

7. Worked example: Central Park heat sequence

  1. Open the Central Park route for 1–23 July 2026.
  2. Confirm station USW00094728 in the Dashboard header.
  3. In Plots, identify the early-July maximum-temperature sequence.
  4. Open Data and verify the rows for 1–4 July, retaining °C or documenting any conversion.
  5. Record that the dates are UTC summary days.
  6. Use the Central Park heatwave case study to see how the key value was compared with a National Weather Service local report.

This separates the roles of the related pages: the Explorer discovers the sequence, this guide documents the procedure, and the article evaluates a specific evidence-led claim.

8. Choose the right source for the claim

SSOD is well suited to globally aligned event chronology and station-level screening. NOAA cautions that synoptic precipitation can be underreported and that reported daily maximum and minimum temperatures may not capture true extremes. For the most accurate local daily rainfall or temperature extreme, NOAA recommends national meteorological service summaries or GHCN-Daily where appropriate.

For climatological context, match the observing site, variable, and calendar period before comparing with the WMO Normals Explorer. The limitations of WMO normals explains why a 1991–2020 average is a reference rather than a complete measure of current risk.

9. Troubleshooting

  • The Dashboard is inactive: select a map point or double-click a Stations Info row.
  • The requested dates changed: confirm the 1,096-day maximum and the Dashboard’s displayed Viewing interval.
  • A plot has gaps: open Data; do not infer zeros from blank cells.
  • The station export lacks observations: Download Stations (Excel) exports station metadata. Use Dashboard Export Data for the selected daily series.
  • A local record does not match SSOD: verify the UTC/local-day boundary and consult the official local daily product.
  • The embedded interface is crowded: use the maximize control in its top-right corner, then press Esc to exit full screen.