May weather in Royal, IA
The average temperature in Royal in May is 59.4°F (47.9°F–70.9°F). Average precipitation: 3.83 inches.
May is a spring month in Royal, and is warmer than the annual average of 46.8°F. Daily temperatures swing about 23°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 28m. For travel, May is a comfortable month to visit.
Avg High
70.9°F
Avg Low
47.9°F
Precipitation
3.83 in
Daylight
14h 28m
May records in Royal
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 97.0°F (2021) | 24.1°F (1997) | 0.93 in (2013) |
| May 2 | 82.0°F (2021) | 23.2°F (2011) | 1.11 in (2024) |
| May 3 | 87.1°F (2015) | 19.9°F (2005) | 0.86 in (2001) |
| May 4 | 86.0°F (2000) | 28.0°F (2005) | 1.07 in (2003) |
| May 5 | 89.1°F (2004) | 28.2°F (2021) | 0.50 in (2001) |
| May 6 | 89.1°F (2016) | 30.2°F (2021) | 2.00 in (2007) |
| May 7 | 91.0°F (2014) | 36.0°F (2003) | 0.58 in (2000) |
| May 8 | 90.0°F (2017) | 32.0°F (2010) | 1.28 in (2024) |
| May 9 | 91.0°F (2022) | 28.2°F (2010) | 0.79 in (2016) |
| May 10 | 95.0°F (2011) | 28.9°F (2002) | 0.68 in (2003) |
| May 11 | 93.9°F (2022) | 28.2°F (2021) | 1.23 in (2018) |
| May 12 | 97.0°F (2022) | 23.2°F (2013) | 1.11 in (2005) |
| May 13 | 90.0°F (2007) | 24.1°F (1997) | 2.98 in (2023) |
| May 14 | 102.9°F (2013) | 30.9°F (1997) | 0.94 in (2015) |
| May 15 | 93.9°F (2001) | 28.9°F (1997) | 0.69 in (2000) |
| May 16 | 88.0°F (2019) | 24.3°F (2014) | 0.62 in (2020) |
| May 17 | 91.9°F (2012) | 29.1°F (2014) | 1.47 in (2020) |
| May 18 | 95.0°F (2012) | 30.0°F (2002) | 0.60 in (2000) |
| May 19 | 93.9°F (2009) | 27.0°F (2002) | 1.40 in (2012) |
| May 20 | 91.9°F (2009) | 30.0°F (1997) | 1.86 in (2011) |
| May 21 | 86.0°F (2007) | 31.1°F (2008) | 2.55 in (2004) |
| May 22 | 88.0°F (2010) | 32.0°F (2022) | 0.40 in (2019) |
| May 23 | 91.9°F (2006) | 37.0°F (2022) | 2.04 in (2009) |
| May 24 | 93.9°F (2010) | 34.0°F (2002) | 1.30 in (2012) |
| May 25 | 93.0°F (2018) | 42.1°F (2000) | 1.40 in (2011) |
| May 26 | 96.1°F (2018) | 39.0°F (1999) | 2.95 in (2013) |
| May 27 | 100.0°F (2018) | 37.0°F (2022) | 2.00 in (2019) |
| May 28 | 99.0°F (2018) | 42.1°F (2021) | 1.07 in (2016) |
| May 29 | 91.0°F (2010) | 33.1°F (2021) | 1.40 in (2008) |
| May 30 | 93.0°F (2023) | 39.9°F (1997) | 2.26 in (2022) |
| May 31 | 91.9°F (2023) | 41.0°F (2010) | 0.48 in (2016) |