Saint-Camille-de-Lellis
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saint-Camille-de-Lellis clear sky chart from 2005-11-06 to 2024-01-27.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	17% 11% 4 8% 7% 4 5% 5% 5% 6% 28%	74655
	Night	16% 10% 4 8% 7% 4 5% 5% 5% 6% 30%	75386
Transparency	Day	57% 7% 11% 17% 8% 1	74358
	Night	56% 7% 11% 17% 8% 1	75218
Seeing	Day	26% 20% 31% 16% 6% 1	14381
	Night	24% 17% 32% 20% 6% 1	22912

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 15% 8% 12% 10% 4 6% 5% 5% 4 18%	1507
	11th to 20th	Day	13% 13% 8% 12% 9% 5% 4 4 3 4 24%	1520
	21st to end	Day	8% 12% 6% 9% 9% 4 6% 5% 5% 7% 26%	1632
February	1st to 10th	Day	10% 14% 7% 12% 11% 7% 7% 5% 6% 5% 18%	1503
	11th to 20th	Day	12% 14% 9% 13% 9% 5% 5% 4 5% 4 21%	1694
	21st to end	Day	11% 14% 5% 11% 9% 5% 5% 4 6% 6% 25%	1480
March	1st to 10th	Day	13% 14% 6% 11% 8% 4 5% 4 4 5% 26%	1797
	11th to 20th	Day	15% 15% 5% 8% 6% 4 5% 5% 5% 4 28%	1930
	21st to end	Day	15% 12% 5% 9% 8% 4 4 4 4 6% 28%	2250
April	1st to 10th	Day	22% 14% 5% 8% 7% 3 4 3 4 5% 25%	2160
	11th to 20th	Day	17% 11% 3 7% 5% 3 4 5% 5% 5% 35%	2258
	21st to end	Day	23% 13% 3 6% 6% 3 4 4 4 6% 28%	2340
May	1st to 10th	Day	20% 10% 4 7% 6% 3 5% 4 4 6% 32%	2340
	11th to 20th	Day	20% 9% 4 7% 6% 4 4 4 5% 6% 32%	2451
	21st to end	Day	18% 7% 3 6% 7% 3 6% 5% 6% 8% 31%	2825
June	1st to 10th	Day	22% 9% 3 6% 7% 3 5% 6% 6% 8% 25%	2700
	11th to 20th	Day	20% 7% 2 6% 6% 4 5% 5% 6% 8% 30%	2700
	21st to end	Day	22% 10% 4 8% 6% 4 6% 5% 6% 6% 24%	2700
July	1st to 10th	Day	16% 7% 3 7% 7% 4 6% 5% 7% 8% 29%	2634
	11th to 20th	Day	15% 8% 3 7% 7% 5% 6% 6% 7% 9% 27%	2520
	21st to end	Day	17% 7% 3 7% 7% 3 6% 6% 8% 8% 28%	2744
August	1st to 10th	Day	18% 7% 3 7% 6% 4 7% 6% 7% 8% 26%	2433
	11th to 20th	Day	15% 8% 3 9% 7% 4 6% 5% 6% 8% 31%	2304
	21st to end	Day	14% 7% 3 7% 6% 4 5% 5% 6% 8% 34%	2521
September	1st to 10th	Day	16% 7% 3 7% 5% 4 4 6% 6% 7% 36%	2138
	11th to 20th	Day	17% 7% 3 5% 5% 3 4 3 5% 6% 42%	1980
	21st to end	Day	18% 7% 3 5% 4 4 4 5% 5% 8% 37%	1980
October	1st to 10th	Day	19% 9% 3 6% 6% 3 4 5% 5% 7% 33%	1968
	11th to 20th	Day	19% 12% 4 8% 6% 3 5% 5% 5% 7% 25%	1680
	21st to end	Day	23% 15% 4 10% 7% 3 3 4 4 5% 22%	1782
November	1st to 10th	Day	17% 13% 4 7% 7% 4 4 4 5% 6% 28%	1671
	11th to 20th	Day	17% 12% 5% 9% 9% 3 6% 6% 5% 5% 24%	1673
	21st to end	Day	16% 17% 4 8% 9% 3 5% 4 6% 6% 21%	1411
December	1st to 10th	Day	19% 16% 7% 12% 9% 4 5% 3 4 5% 18%	1330
	11th to 20th	Day	18% 13% 7% 10% 7% 3 5% 4 4 4 24%	1668
	21st to end	Day	19% 17% 6% 9% 7% 3 5% 4 4 4 21%	2431
January	1st to 10th	Night	12% 15% 7% 14% 9% 4 6% 5% 5% 6% 17%	2654
	11th to 20th	Night	12% 14% 6% 12% 9% 5% 5% 4 5% 6% 22%	2660
	21st to end	Night	8% 10% 5% 9% 9% 5% 6% 7% 7% 8% 27%	2868
February	1st to 10th	Night	8% 13% 5% 11% 10% 6% 7% 6% 5% 6% 23%	2457
	11th to 20th	Night	9% 12% 6% 12% 10% 5% 6% 5% 6% 6% 21%	2151
	21st to end	Night	12% 12% 5% 8% 9% 4 5% 4 5% 6% 30%	1776
March	1st to 10th	Night	12% 12% 7% 7% 8% 4 6% 4 5% 7% 29%	2150
	11th to 20th	Night	14% 11% 4 9% 6% 4 6% 6% 5% 6% 31%	2029
	21st to end	Night	14% 11% 4 9% 7% 4 5% 5% 5% 5% 31%	2103
April	1st to 10th	Night	18% 12% 5% 8% 6% 3 4 5% 5% 5% 28%	1800
	11th to 20th	Night	16% 11% 3 7% 5% 4 4 5% 5% 7% 34%	1650
	21st to end	Night	22% 11% 4 6% 6% 3 4 4 4 5% 31%	1620
May	1st to 10th	Night	21% 9% 3 6% 6% 2 6% 5% 5% 6% 31%	1620
	11th to 20th	Night	20% 6% 3 6% 5% 4 4 5% 5% 5% 37%	1456
	21st to end	Night	19% 5% 3 6% 6% 3 4 5% 6% 6% 37%	1448
June	1st to 10th	Night	22% 9% 3 6% 6% 4 6% 5% 6% 7% 27%	1260
	11th to 20th	Night	17% 6% 3 5% 5% 3 4 5% 6% 7% 38%	1260
	21st to end	Night	20% 7% 3 7% 6% 3 5% 5% 6% 7% 32%	1260
July	1st to 10th	Night	15% 7% 3 5% 5% 3 5% 6% 6% 8% 37%	1322
	11th to 20th	Night	14% 5% 2 5% 6% 4 6% 6% 7% 8% 37%	1440
	21st to end	Night	13% 6% 3 7% 6% 4 5% 6% 7% 8% 35%	1574
August	1st to 10th	Night	15% 5% 2 4 5% 3 4 5% 6% 9% 41%	1486
	11th to 20th	Night	15% 6% 3 7% 5% 3 5% 6% 6% 8% 37%	1596
	21st to end	Night	12% 6% 3 5% 5% 3 4 5% 6% 8% 44%	1831
September	1st to 10th	Night	14% 5% 2 6% 5% 4 5% 5% 6% 8% 41%	1822
	11th to 20th	Night	16% 7% 2 4 5% 3 4 5% 5% 5% 45%	1980
	21st to end	Night	16% 6% 3 4 5% 3 5% 4 6% 7% 41%	1980
October	1st to 10th	Night	17% 7% 2 6% 5% 3 4 5% 6% 7% 40%	1991
	11th to 20th	Night	21% 10% 3 5% 6% 3 5% 5% 4 6% 31%	2276
	21st to end	Night	20% 13% 4 7% 5% 4 4 5% 5% 5% 27%	2574
November	1st to 10th	Night	16% 11% 4 6% 7% 4 5% 6% 6% 7% 28%	2407
	11th to 20th	Night	16% 9% 4 9% 7% 4 5% 5% 6% 7% 30%	2504
	21st to end	Night	16% 12% 5% 10% 8% 4 5% 5% 5% 6% 25%	2764
December	1st to 10th	Night	18% 12% 6% 11% 9% 5% 6% 5% 5% 5% 19%	2850
	11th to 20th	Night	19% 13% 5% 11% 8% 5% 4 4 4 5% 22%	3531
	21st to end	Night	19% 18% 5% 9% 7% 3 4 4 4 4 25%	5236

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	72% 6% 7% 10% 6%	1508
	11th to 20th	Day	67% 5% 6% 15% 6% 2	1520
	21st to end	Day	58% 6% 8% 16% 11% 1	1632
February	1st to 10th	Day	70% 4 6% 11% 7% 1	1503
	11th to 20th	Day	68% 5% 8% 10% 7% 1	1703
	21st to end	Day	61% 6% 7% 16% 8% 3	1480
March	1st to 10th	Day	61% 5% 9% 13% 10% 2	1800
	11th to 20th	Day	59% 7% 8% 13% 11% 1	1930
	21st to end	Day	60% 5% 8% 16% 9% 2	2250
April	1st to 10th	Day	63% 5% 8% 13% 8% 3	2160
	11th to 20th	Day	52% 6% 10% 20% 11% 2	2258
	21st to end	Day	59% 5% 8% 16% 10% 3	2340
May	1st to 10th	Day	54% 6% 10% 17% 12% 2	2340
	11th to 20th	Day	53% 6% 12% 19% 9% 1	2455
	21st to end	Day	52% 8% 13% 18% 9%	2825
June	1st to 10th	Day	57% 8% 11% 17% 7% 1	2700
	11th to 20th	Day	50% 8% 12% 20% 9% 1	2700
	21st to end	Day	61% 8% 9% 15% 7%	2700
July	1st to 10th	Day	51% 9% 15% 19% 6%	2562
	11th to 20th	Day	51% 9% 14% 20% 6%	2445
	21st to end	Day	54% 9% 14% 18% 5% 1	2591
August	1st to 10th	Day	54% 10% 16% 18% 3	2419
	11th to 20th	Day	51% 10% 15% 18% 7%	2304
	21st to end	Day	47% 7% 14% 23% 8%	2521
September	1st to 10th	Day	46% 8% 15% 20% 10% 1	2138
	11th to 20th	Day	43% 6% 11% 27% 12% 1	1980
	21st to end	Day	45% 8% 13% 23% 11%	1980
October	1st to 10th	Day	51% 6% 12% 23% 9%	1968
	11th to 20th	Day	59% 8% 14% 16% 3	1680
	21st to end	Day	65% 6% 9% 14% 5% 1	1782
November	1st to 10th	Day	58% 7% 11% 16% 7%	1671
	11th to 20th	Day	62% 7% 10% 13% 7% 1	1673
	21st to end	Day	65% 8% 9% 14% 4	1411
December	1st to 10th	Day	71% 6% 7% 12% 4	1330
	11th to 20th	Day	65% 5% 9% 12% 9% 1	1668
	21st to end	Day	67% 7% 7% 12% 6% 2	2431
January	1st to 10th	Night	72% 6% 8% 10% 4 1	2654
	11th to 20th	Night	67% 6% 9% 12% 6% 1	2660
	21st to end	Night	55% 8% 11% 15% 8% 2	2868
February	1st to 10th	Night	64% 6% 9% 12% 8% 1	2457
	11th to 20th	Night	67% 6% 8% 11% 7% 1	2153
	21st to end	Night	58% 5% 9% 16% 11% 1	1776
March	1st to 10th	Night	58% 6% 8% 18% 9% 2	2160
	11th to 20th	Night	55% 8% 10% 15% 11% 2	2030
	21st to end	Night	57% 5% 9% 18% 9% 3	2103
April	1st to 10th	Night	59% 5% 8% 14% 11% 3	1800
	11th to 20th	Night	51% 5% 10% 20% 12% 2	1650
	21st to end	Night	57% 6% 9% 16% 10% 2	1620
May	1st to 10th	Night	53% 6% 10% 17% 12% 1	1620
	11th to 20th	Night	50% 7% 10% 19% 13% 1	1457
	21st to end	Night	48% 9% 12% 18% 13%	1449
June	1st to 10th	Night	55% 8% 13% 17% 6%	1260
	11th to 20th	Night	46% 8% 12% 22% 11% 2	1260
	21st to end	Night	52% 10% 14% 16% 8%	1260
July	1st to 10th	Night	43% 11% 18% 21% 7%	1284
	11th to 20th	Night	44% 9% 18% 22% 7%	1392
	21st to end	Night	47% 10% 15% 20% 9%	1486
August	1st to 10th	Night	41% 8% 21% 27% 2	1476
	11th to 20th	Night	44% 10% 18% 22% 6%	1596
	21st to end	Night	37% 9% 17% 28% 9%	1831
September	1st to 10th	Night	41% 8% 16% 25% 9% 1	1822
	11th to 20th	Night	42% 6% 17% 25% 10%	1980
	21st to end	Night	44% 8% 12% 23% 13%	1980
October	1st to 10th	Night	44% 7% 13% 24% 12% 1	1991
	11th to 20th	Night	55% 7% 13% 19% 5%	2276
	21st to end	Night	59% 7% 11% 15% 7%	2574
November	1st to 10th	Night	55% 9% 13% 17% 6%	2407
	11th to 20th	Night	55% 8% 11% 15% 9% 1	2504
	21st to end	Night	63% 7% 12% 13% 4	2764
December	1st to 10th	Night	69% 7% 10% 10% 3	2850
	11th to 20th	Night	68% 5% 9% 13% 6%	3532
	21st to end	Night	65% 5% 8% 14% 6% 1	5236

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	26% 36% 28% 8% 2 1	180
	11th to 20th	Day	31% 25% 33% 9% 2 1	180
	21st to end	Day	21% 27% 37% 13% 3	188
February	1st to 10th	Day	32% 24% 35% 7% 1	223
	11th to 20th	Day	27% 29% 34% 8% 2	392
	21st to end	Day	26% 27% 32% 12% 3	346
March	1st to 10th	Day	27% 27% 31% 12% 3	420
	11th to 20th	Day	26% 26% 30% 13% 5%	420
	21st to end	Day	29% 23% 25% 16% 5% 1	462
April	1st to 10th	Day	36% 21% 25% 13% 5%	420
	11th to 20th	Day	31% 24% 26% 14% 5% 1	412
	21st to end	Day	35% 17% 31% 11% 4 1	420
May	1st to 10th	Day	32% 15% 36% 13% 3 1	423
	11th to 20th	Day	28% 18% 33% 17% 4 1	447
	21st to end	Day	23% 22% 34% 15% 6%	585
June	1st to 10th	Day	27% 18% 33% 16% 5% 1	630
	11th to 20th	Day	23% 17% 27% 24% 8%	630
	21st to end	Day	27% 15% 29% 20% 8% 1	630
July	1st to 10th	Day	20% 13% 38% 19% 9% 1	557
	11th to 20th	Day	19% 15% 37% 20% 7% 1	444
	21st to end	Day	19% 13% 37% 24% 7% 1	488
August	1st to 10th	Day	20% 14% 33% 24% 7% 2	446
	11th to 20th	Day	19% 12% 31% 26% 9% 2	439
	21st to end	Day	23% 15% 29% 20% 9% 4	495
September	1st to 10th	Day	19% 17% 29% 22% 10% 3	450
	11th to 20th	Day	26% 11% 31% 19% 10% 3	450
	21st to end	Day	23% 15% 29% 18% 11% 4	450
October	1st to 10th	Day	22% 20% 25% 20% 10% 3	444
	11th to 20th	Day	32% 18% 27% 13% 9% 1	360
	21st to end	Day	35% 23% 27% 12% 4	396
November	1st to 10th	Day	32% 18% 32% 15% 3 1	365
	11th to 20th	Day	27% 23% 28% 15% 6% 1	370
	21st to end	Day	30% 28% 26% 13% 2 1	261
December	1st to 10th	Day	33% 21% 30% 13% 3 1	180
	11th to 20th	Day	33% 30% 28% 6% 2 1	180
	21st to end	Day	36% 27% 21% 14% 2 1	198
January	1st to 10th	Night	26% 26% 35% 12% 1	763
	11th to 20th	Night	26% 25% 34% 13% 2	760
	21st to end	Night	18% 24% 37% 18% 3	820
February	1st to 10th	Night	20% 28% 35% 13% 3	720
	11th to 20th	Night	24% 25% 35% 13% 2	703
	21st to end	Night	24% 19% 38% 16% 3	592
March	1st to 10th	Night	24% 18% 38% 17% 2	720
	11th to 20th	Night	24% 22% 33% 15% 5% 1	720
	21st to end	Night	23% 20% 30% 21% 5%	792
April	1st to 10th	Night	30% 18% 31% 16% 5%	720
	11th to 20th	Night	24% 17% 32% 20% 5%	586
	21st to end	Night	32% 13% 28% 19% 7%	540
May	1st to 10th	Night	26% 13% 31% 22% 7%	540
	11th to 20th	Night	25% 11% 31% 26% 6% 1	395
	21st to end	Night	23% 13% 31% 25% 8%	389
June	1st to 10th	Night	28% 8% 33% 24% 7% 1	360
	11th to 20th	Night	19% 9% 31% 31% 9% 1	360
	21st to end	Night	21% 8% 35% 28% 8% 1	360
July	1st to 10th	Night	16% 8% 37% 28% 11% 1	350
	11th to 20th	Night	15% 6% 33% 36% 10%	348
	21st to end	Night	18% 7% 31% 35% 9%	394
August	1st to 10th	Night	17% 5% 29% 36% 13% 1	412
	11th to 20th	Night	15% 8% 30% 32% 14% 1	532
	21st to end	Night	15% 7% 32% 33% 12% 2	643
September	1st to 10th	Night	16% 10% 34% 28% 11% 1	720
	11th to 20th	Night	21% 10% 30% 26% 12% 2	720
	21st to end	Night	22% 12% 31% 22% 13% 1	720
October	1st to 10th	Night	23% 14% 28% 25% 9%	720
	11th to 20th	Night	27% 14% 31% 19% 8% 1	720
	21st to end	Night	32% 19% 29% 16% 4	792
November	1st to 10th	Night	29% 18% 29% 19% 5%	740
	11th to 20th	Night	25% 21% 30% 16% 8% 1	776
	21st to end	Night	25% 23% 31% 16% 4 1	850
December	1st to 10th	Night	31% 20% 33% 12% 4	850
	11th to 20th	Night	28% 25% 27% 15% 5%	850
	21st to end	Night	30% 26% 29% 13% 3 1	935

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