Climate Trends in Portugal

• In Portugal, the longest run of hot days in a row in the data is 18 days, at Beja (Portugal), from 27 July 2003 to 13 August 2003.
• In Portugal, the longest run of days in a row at or above 40 C in the data is 7 days, at Beja (Portugal), from 11 July 1991 to 17 July 1991.
• In Portugal, the longest run of frost days in a row in the data is 32 days, at Braganca (Portugal), from 9 February 2005 to 12 March 2005.
• In Portugal, the longest run of dry days in a row in the data is 186 days, at Tavira (Portugal), in 1945.
• In Portugal, the longest run of wet days in a row in the data is 34 days, at Extremo (Portugal), in 2000.
• In Portugal, the longest run of longest run of nights at or above 25 c in the data is 3 days, at Lisboa Geofisica (Portugal), from 24 June 1948 to 26 June 1948.

Longest run of days at or above 35 C

Consecutive days with a daily maximum at or above 35 C (95 F).

Longest run of days at or above 40 C

Consecutive days with a daily maximum at or above 40 C (104 F).

Longest run of frost days (minimum at or below 0 C)

Consecutive days with a daily minimum at or below 0 C (32 F).

Longest dry spell (days under 1 mm of rain), within one year

Consecutive days with less than 1 mm (0.04 in) of rain, the longest run within a year. The dates are not kept, so the list gives the year (within the year).

Longest wet spell (days with 1 mm or more of rain), within one year

Consecutive days with 1 mm (0.04 in) or more of rain, the longest run within a year. The dates are not kept, so the list gives the year (within the year).

Longest run of nights at or above 25 C

A run belongs to the year it started in, even when it ran on into the next year. A station appears once per list, with its longest run in a complete year. Dry and wet spells are the longest run within a year. Lists use complete years only, so a long run in a year with gaps in the record is not counted.

• In Portugal, the largest reported one day rise in the daily maximum is 16.7 C (30.1 F), at Lisboa Geofisica (Portugal) on 4 July 2010.
• In Portugal, the largest reported one day drop in the daily maximum is 17.2 C (31.0 F), at Coimbra (Portugal) on 13 July 1917.
• In Portugal, the largest reported one day rise in the daily minimum is 15.9 C (28.6 F), at Lajes Ab (Portugal) on 22 January 1995.
• In Portugal, the largest reported one day drop in the daily minimum is 16.2 C (29.2 F), at Lajes Ab (Portugal) on 13 December 1997.
• In Portugal, the largest reported widest range between the high and the low of one day is 33.6 C (60.5 F), at Coimbra (Portugal) on 30 July 1944.
• In Portugal, the smallest reported narrowest range between the high and the low of one day is 0.0 C (0.0 F), at Lisboa Geofisica (Portugal) on 1 February 1913.

Caveat.Single readings can still be instrument errors that quality control missed. A station with one faulty value can top a list, so read each entry as a reported value, not as a confirmed event.

Biggest one day rise in the daily maximum

The largest increase in the daily maximum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Biggest one day drop in the daily maximum

The largest decrease in the daily maximum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Biggest one day rise in the daily minimum

The largest increase in the daily minimum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Biggest one day drop in the daily minimum

The largest decrease in the daily minimum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Widest range between the high and the low of one day

The largest difference between the highest and the lowest temperature of the same day. Values are in degrees Celsius with Fahrenheit beside them.

Narrowest range between the high and the low of one day

The smallest difference between the highest and the lowest temperature of the same day. Values are in degrees Celsius with Fahrenheit beside them.

Only stations with at least 10 complete years are listed, and a station appears once per list.