Table 3.
Mean monthly temperature, precipitation and radiation averaged for light ring years and remaining normal years. Student-t tests verify significance level of differences between those two groups of years. For calculations monthly averaged data for temperature (1780–2008 – 6 light ring years) and for solar radiation (1884–2008 – 4 light ring years), as well as monthly sums of precipitation (1800–2008 – 6 light ring years) were used.
| Months | Mean temperatures and in parentheses standard deviations |
Verification of the difference between light ring years and remaining years |
Mean precipitations and in parentheses standard deviations |
Verification of the difference between light ring years and remaining years |
Mean radiations and in parentheses standard deviations |
Verification of the difference between light ring years and remaining years |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Remaining years | Light ring years | Student t test | Significance levels | Remaining years | Light ring years | Student t test | Significance levels | Remaining years | Light ring years | Student t test | Significance levels | |
| January | −5.2 (2.4) | −6.4 (1.9) | 1.514 | P < 0.10 | 10.6 (6.2) | 13.3 (8.0) | −0.816 | Not significant | 4.7 (1.9) | 4.7 (1.3) | −0.001 | Not significant |
| February | −4.3 (2.4) | −5.2 (3.0) | 0.670 | Not significant | 10.5 (6.3) | 9.1 (4.9) | 0.709 | Not significant | 8.9 (3.3) | 6.9 (1.3) | 2.518 | P < 0.01 |
| March | −1.6 (2.1) | −2.1 (1.6) | 0.686 | Not significant | 11.8 (6.3) | 9.1 (5.2) | 1.237 | P < 0.10 | 13.5 (3.6) | 15.1 (3.7) | −0.751 | Not significant |
| April | 2.3 (1.7) | 1.6 (1.5) | 1.154 | Not significant | 12.0 (5.3) | 11.7 (2.5) | 0.260 | Not significant | 16.3 (4.2) | 15.0 (7.4) | 0.297 | Not significant |
| May | 7.3 (1.8) | 6.8 (1.4) | 0.815 | Not significant | 13.1 (4.6) | 14.7 (4.6) | −0.834 | Not significant | 22.1 (4.3) | 23.2 (4.2) | −0.437 | Not significant |
| June | 10.3 (1.5) | 9.8 (0.9) | 1.511 | P < 0.10 | 20.0 (5.5) | 22.8 (7.1) | −0.938 | Not significant | 22.4 (4.3) | 24.5 (4.1) | −0.865 | Not significant |
| July | 12.2 (1.4) | 11.9 (0.8) | 0.995 | Not significant | 23.2 (6.7) | 22.9 (3.2) | 0.217 | Not significant | 23.0 (4.2) | 22.9 (2.4) | 0.012 | Not significant |
| August | 12.0 (1.4) | 9.9 (0.9) | 5.650 | P < 0.0005 | 21.1 (6.2) | 24.1 (5.4) | −1.354 | Not significant | 23.4 (4.2) | 17.3 (0.6) | 11.533 | P < 0.0005 |
| September | 9.1 (1.5) | 7.5 (2.4) | 1.655 | P < 0.05 | 15.3 (6.6) | 19.6 (7.1) | −1.472 | Not significant | 17.7 (4.0) | 11.7 (8.2) | 1.267 | Not significant |
| October | 4.9 (1.7) | 3.9 (1.6) | 1.524 | P < 0.10 | 11.2 (5.9) | 9.2 (5.6) | 0.829 | Not significant | 11.4 (3.7) | 9.9 (2.9) | 0.881 | Not significant |