旬ごとの値
 |  |
 |  |
 |  |  |  |  |
 |  |  |  |  |  |
 |  |  |  |  |
室蘭（胆振地方) 2003年（旬ごとの値） 詳細（気圧・降水量）
| 月 | 旬 | 気圧(hPa) | 降水量(mm) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 現地 | 海面 | 合計 | 最大 | 各階級の日数 | ||||||||||||||||
| 平均 | 平均 | 最低 | 日 | 1時間 | 10分間 | ≧0.0mm | ≧0.5mm | ≧1.0mm | ≧10.0mm | ≧30.0mm | ≧50.0mm | ≧70.0mm | ≧100.0mm | |||||||
| 値 | 日 | 値 | 日 | 値 | 日 | 値 | 日 | |||||||||||||
| 上旬 | 1007.7 | 1014.0 | 992.3 | 05 | 15.5 | 6.0 | 04 | 2.0 | 05* | 1.0 | 05 | 10 | 6 | 4 | 0 | 0 | 0 | 0 | 0 | |
| 中旬 | 1007.1 | 1013.3 | 1003.9 | 11 | 11.0 | 4.5 | 13 | 3.5 | 13 | 1.0 | 13 | 10 | 7 | 6 | 0 | 0 | 0 | 0 | 0 | |
| 下旬 | 1001.4 | 1007.6 | 982.7 | 28 | 37.5 | 20.5 | 27 | 4.0 | 27 | 1.5 | 21 | 10 | 6 | 4 | 1 | 0 | 0 | 0 | 0 | |
| 上旬 | 1011.7 | 1017.9 | 1013.5 | 01 | 4.0 | 1.0 | 04* | 0.5 | 09* | 0.5 | 09* | 10 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | |
| 中旬 | 1009.2 | 1015.5 | 1008.4 | 12 | 14.0 | 10.5 | 20 | 2.5 | 20 | 1.0 | 20 | 10 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | |
| 下旬 | 1012.2 | 1018.5 | 1012.3 | 22 | 1.0 | 1.0 | 26 | 0.5 | 26 | 0.5 | 26 | 5 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | |
| 上旬 | 1006.6 | 1012.9 | 986.7 | 04 | 27.5 | 17.5 | 03 | 5.0 | 03 | 1.0 | 03 | 5 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | |
| 中旬 | 1013.5 | 1019.7 | 1008.4 | 19 | 1.0 | 1.0 | 19 | 0.5 | 19 | 0.5 | 19 | 6 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | |
| 下旬 | 1007.6 | 1013.7 | 994.4 | 28 | 23.0 | 21.0 | 27 | 4.0 | 27 | 1.0 | 27 | 7 | 4 | 2 | 1 | 0 | 0 | 0 | 0 | |
| 上旬 | 1007.6 | 1013.7 | 998.0 | 09 | 15.5 | 11.5 | 09 | 3.5 | 09 | 1.0 | 09 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | |
| 中旬 | 1007.7 | 1013.8 | 999.1 | 13 | 18.0 | 9.5 | 19 | 3.5 | 13 | 1.5 | 13 | 5 | 5 | 3 | 0 | 0 | 0 | 0 | 0 | |
| 下旬 | 1007.2 | 1013.2 | 992.7 | 30 | 66.0 | 23.0 | 30 | 8.5 | 30 | 2.0 | 30 | 7 | 5 | 4 | 3 | 0 | 0 | 0 | 0 | |
| 上旬 | 1006.9 | 1012.9 | 993.9 | 08 | 36.0 | 23.5 | 08 | 6.5 | 08 | 2.0 | 07 | 4 | 3 | 2 | 2 | 0 | 0 | 0 | 0 | |
| 中旬 | 1010.5 | 1016.5 | 1008.8 | 20 | 0.5 | 0.5 | 19 | 0.5 | 19 | 0.5 | 19 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 下旬 | 1011.7 | 1017.7 | 1001.6 | 31 | 3.0 | 1.5 | 31* | 1.5 | 27 | 0.5 | 31* | 5 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | |
| 上旬 | 1004.9 | 1010.8 | 994.5 | 01 | 8.5 | 8.5 | 01 | 3.5 | 01 | 1.5 | 01 | 5 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | |
| 中旬 | 1002.4 | 1008.2 | 996.9 | 20 | 67.5 | 63.5 | 20 | 7.0 | 20 | 2.0 | 20 | 7 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | |
| 下旬 | 1001.8 | 1007.7 | 999.4 | 21 | 71.5 | 29.0 | 25 | 14.0 | 25 | 5.0 | 25 | 9 | 6 | 6 | 3 | 0 | 0 | 0 | 0 | |
| 上旬 | 1006.7 | 1012.6 | 1003.7 | 10 | 77.0 | 54.5 | 10 | 11.5 | 10 | 3.0 | 10 | 9 | 4 | 4 | 2 | 1 | 1 | 0 | 0 | |
| 中旬 | 1005.1 | 1010.9 | 1002.9 | 14 | 5.5 | 5.5 | 20 | 3.5 | 20 | 1.5 | 20 | 9 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | |
| 下旬 | 1008.2 | 1014.1 | 1001.4 | 30 | 13.5 | 8.0 | 30 | 3.0 | 30 | 1.0 | 30 | 8 | 5 | 4 | 0 | 0 | 0 | 0 | 0 | |
| 上旬 | 1001.3 | 1007.0 | 989.1 | 09 | 115.5 | 79.0 | 09 | 14.0 | 09 | 5.5 | 09 | 9 | 5 | 5 | 3 | 1 | 1 | 1 | 0 | |
| 中旬 | 1010.7 | 1016.5 | 1005.0 | 12 | 6.5 | 4.5 | 11 | 1.5 | 14* | 0.5 | 20* | 8 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | |
| 下旬 | 1004.1 | 1009.9 | 1000.9 | 23 | 50.5 | 29.0 | 28 | 14.0 | 23 | 4.0 | 23 | 9 | 4 | 4 | 2 | 0 | 0 | 0 | 0 | |
| 上旬 | 1008.7 | 1014.5 | 1004.5 | 10 | 74.5 | 39.0 | 10 | 23.5 | 10 | 8.0 | 10 | 6 | 4 | 4 | 2 | 1 | 0 | 0 | 0 | |
| 中旬 | 1006.4 | 1012.2 | 987.5 | 14 | 36.5 | 19.0 | 19 | 5.0 | 13 | 3.5 | 13 | 4 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | |
| 下旬 | 1008.9 | 1014.8 | 1003.2 | 30 | 56.0 | 43.0 | 25 | 11.0 | 25 | 2.5 | 25 | 6 | 5 | 5 | 1 | 1 | 0 | 0 | 0 | |
| 上旬 | 1012.1 | 1018.0 | 998.3 | 02 | 11.0 | 5.5 | 02 | 2.0 | 02 | 1.5 | 06 | 6 | 5 | 3 | 0 | 0 | 0 | 0 | 0 | |
| 中旬 | 1008.3 | 1014.2 | 1004.6 | 13 | 5.0 | 2.5 | 18 | 1.5 | 18 | 0.5 | 19* | 9 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | |
| 下旬 | 1006.3 | 1012.2 | 996.5 | 23 | 43.5 | 16.0 | 23 | 7.0 | 29 | 3.0 | 29 | 8 | 6 | 6 | 2 | 0 | 0 | 0 | 0 | |
| 上旬 | 1012.2 | 1018.2 | 1005.4 | 03 | 0.5 | 0.5 | 03 | 0.5 | 03 | 0.5 | 03 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 中旬 | 1013.5 | 1019.6 | 1000.1 | 16 | 30.0 | 13.5 | 15 | 8.0 | 15 | 2.0 | 15 | 6 | 4 | 3 | 2 | 0 | 0 | 0 | 0 | |
| 下旬 | 1016.8 | 1022.9 | 992.2 | 21 | 36.5 | 22.5 | 29 | 5.5 | 29 | 3.0 | 29 | 8 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | |
| 上旬 | 1011.4 | 1017.6 | 995.1 | 07* | 9.5 | 6.0 | 06 | 2.0 | 06 | 0.5 | 08* | 9 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | |
| 中旬 | 1003.4 | 1009.5 | 994.0 | 20 | 61.0 | 53.0 | 18 | 11.0 | 18 | 3.0 | 18 | 7 | 4 | 3 | 1 | 1 | 1 | 0 | 0 | |
| 下旬 | 1001.4 | 1007.5 | 991.8 | 25 | 18.5 | 8.5 | 29 | 3.0 | 29 | 2.0 | 25 | 11 | 7 | 6 | 0 | 0 | 0 | 0 | 0 | |