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Nature

Record of Maximum Instantaneous Wind Speed in Tokyo

The wind velocity was very fast in Tokyo yesterday. It is common for Japanese people to dry laundries outside. Yesterday my laundries were blew off from the laundry pole. Japan Meteorological Agency has been recording the data of maximum i…

How Accurate is the Weather Forecast in Japan?

Japan Meteorological Agency publishes the result of their weather forecasts. It is the percentage of right forecasting cases. The below is the average percentage of the right forecasts which predicted a chance of rain (data in 1992 - 2013)…

List of Volcanic Disasters in Japan after 1970

Today (2014 Sep 27) Mt. Ontake in Nagano prefecture erupted and 63 hikers died by ashes.The following list shows volcanic disasters in Japan after 1970. Mountain Period Cause Damage Usu 1977-1982 Ash, crustal deformation, mudflow 1978 Oct…

Seven Worst Floods in Japan (after WWII)

Until 1960, many people died by floods in Japan. The table below shows 7 worst flood disaster after Word War II. Flood name or cause Flood name or cause Number of Deaths Number of Missings Year from MM/DD to MM/DD 1 Isewan typhoon 伊勢湾台…

Notable Earthquakes in June 2014, Japan

In last June (2014), we had 143 earthquakes which were greater than "earthquake intensity one". None of them were greater than "earthquake intensity five". No tsunami and no casualty were reported. On June 24th, there was a big earthquake …

Number of Rainy Days in Tokyo

On average, we have 105 rainy days with more than 1 mm of rainfall in Tokyo. The following figure shows the number of rainy days by year in Tokyo. In 1890 we had the most rainy days (145 days), and the number of 1943 was the least (73 days…

Predicted Number of Deaths in Next Super Quake in Japan

Japanese government predicts a huge earthquake called “Huge Nankai quake” may be coming in next 30 years. Its probability is 60-70%. The government estimates 440,000 people might die in the worst case, if Huge Nankai quake hits Japan. (App…

Damages Caused by Historical Strong Typhoons in Japan

The data below shows damages caused by historical typhoons in Japan. In 1959 typhoon Isewan hit the populated area around Nagoya. 5000 people died by typhoon Isewan. It was the worst case. After that, Japan prepared countermeasures against…

Top 5 Strongest Typhoons Ever in Japan

Japan Meteorological Agency has been recording typhoons data since 1951. According to the record, the strongest typhoon (in terms of atmospheric pressure) was Muroto 2 (Nancy). Please see also "Damages Caused by Historical Strong Typhoons …

Notable Earthquakes in May 2014 in Japan

In May, Total 187 earthquakes which were larger than "earthquake intensity one" were observed. There was one earthquake bigger than earthquake intensity five (No. 4 in the table below). 15 people injured by the earthquake of No. 4. Table: …

Number of Tornadoes (Twisters) in Japan

The table below shows the number of tornadoes (twisters) which were formed in Japan. Approximately 25 tornadoes are formed in a year. Japan Meteorological Agency changed the standard of the tornado statistics in 2007. So we cannot compare …

Notable Earthquakes in April 2014 in Japan

The following table shows notable earthquakes in April 2014 in Japan. Total 153 earthquakes which were greater than "earthquake intensity one" were observed. There was no big earthquake (bigger than earthquake intensity five). No casualty …

When does the rainy season start in Tokyo?

Tokyo has the rainy season in June and July. It usually starts around June 8th, and ends around July 21st. 43 days wet season is coming soon. 2014 July 28 updated: Japan Meteorological Agency announced that this rainy season (2014) started…

Number of Days Over 30 degrees C (86 F) in Tokyo

According to Japan Meteorological Agency, there were average 48.5 days in which the highest temperature exceeded 30 degrees C (86 F). It was the average number in last two decades. The following table shows the detail. There were 71 "tropi…

Highest Temperature Record in Tokyo

Updated: 2018 July 24. The table below shows the record of highest temperature (hottest temperature) in Tokyo as of 2018 July 23. The temperature has been recording since 1875. Seven of ten were recorded in last three decades. Rank Tempera…

Notable Earthquakes in March 2014 in Japan

The table below shows notable earthquakes in March 2014 in Japan. Total 159 earthquakes which were greater than "earthquake intensity 1" were observed in March. Earthquake No. 4 was the strongest earthquake and Japan Meteorological Agency …

Notable Earthquakes in February 2014 in Japan

The list shows notable earthquakes in February 2014 in Japan. Total 146 earthquakes which were bigger than "earthquake intensity 1" were observed in February. There was no big earthquake (bigger than earthquake intensity 5). No tsunami and…

Average Wind Speed in Tokyo (1989-2011)

Here is the average wind speed in Tokyo (1989-2011). For 2011 data, you can see monthly records. Average wind speed Maximum wind speed Maximum wind Direction Date of Maximum wind m/s m/s MM/DD 1989 3.7 14.6 NNW 1/21 1990 3.6 14.4 S 9/20 19…

Notable Earthquakes in January 2014 in Japan

The list shows notable earthquakes in January 2014 in Japan. Total 152 earthquakes which were bigger than "earthquake intensity 1" were observed in January. No tsunami and no casualty were reported. No. Date Earthquake center Earthquake ce…

Notable Earthquakes in December 2013 in Japan

The list shows notable earthquakes in December 2013 in Japan. Total 170 earthquakes which were bigger than "earthquake intensity 1" were observed in December. No tsunami and no casualty were reported. Japan Meteorological Agency says numbe…

Snowfall records in Tokyo

The following shows snow records since 1946 in Tokyo, as of 2013. Year Number of snowy days Deepest record (cm) inch Deepest snow date mm/dd 1946 20 12 4.7 3/3 1947 17 17 6.7 2/15 1948 6 4 1.6 12/17 1949 8 4 1.6 3/14 1950 13 8 3.1 1/14 195…

Prediction about pollen dispersion of cedar and cypress in spring 2014 in Tokyo

Feb 1st updated Tokyo Metropolitan government announced this season's prediction about the pollen dispersion of cedar and cypress. Fortunately it is not going to be severe this year. Possible start date of pollen dispersion : Probably the …

Number of Typhoon Developments in Pacific Ocean,1951-2013

Every year 20-30 typhoons are generated in the northen Pacific Ocean. The following shows the number of typhoons which were generated during 1951-2013. The average number of typhoons is 26.2 in a year. Year Jan Feb Mar Apr May Jun Jul Aug …

Coldest Temperature Record in Tokyo

The following table shows the record of the coldest temperature in Tokyo. The temperature has been recording since 1875. All coldest cases happened before World War II. Rank degrees C degrees F Date yyyy/m/dd 1 -9.2 15.44 (1876/ 1/13) 2 -9…

Duration of Sunshine in Tokyo (1989-2011)

The following shows statistics of sunshine in Tokyo. It includes the yearly average amount of clouds, duration of sunshine and percentage of sunshine. There is also monthly data in terms of 2011. Average amount of clouds Duration of sunshi…

Average Humidity in Tokyo 1989-2011

The following table shows the yearly average humidity in Tokyo (1989-2011). For 2011 you can see monthly data of the average humidity. Year Average humidity (%) Minimum humidity (%) Date of minimum humidity (mm/dd) 1989 64 16 4/13 1990 62 …

Tokyo is getting warmer slightly??? Average Temperature & Atmospheric Pressure in Tokyo, 1989-2011

The following table shows average temperature and sea level average atmospheric pressure in Tokyo, from 1989 to 2011. In terms of 2011, I added monthly data. Year Average atmospheric pressure (sea level) Average Temperature Average highs A…

Notable Earthquakes in November of 2013 in Japan

The list shows notable earthquakes in November of 2013 around Japan. No. 10 was the biggest, but it was not felt by human body in Japan. No tsunami was observed in November. There was no casualty fortunately. No. Date Earthquake center Ear…

Notable Earthquakes in October of 2013 in Japan

The list shows notable earthquakes in October of 2013 around Japan. At the earthquake on Oct 26th, tsunami was observed in Iwate, Miyagi and Fukushima prefectures. One person was injured by that earthquake. Date Earthquake center Earthquak…

When does Freezing start in Tokyo

The following list shows the first date of "frost, snow, freezing" and the last date of them in Tokyo. The date format is MM/DD. Last winter (2012-13) we had 5 snow falls. Usually we do not have snow covering here. Year First frost Last fr…

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