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 2025-02-06.

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	16% 11% 4 10% 6% 5% 5% 4 5% 6% 28%	107924
	Night	14% 12% 4 10% 6% 5% 5% 4 5% 6% 28%	110361
Transparency	Day	56% 8% 11% 17% 8% 1	111438
	Night	57% 7% 11% 16% 8% 1	115012
Seeing	Day	26% 20% 31% 16% 6% 1	15705
	Night	24% 17% 32% 20% 6%	24232

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	14% 17% 8% 14% 7% 5% 6% 3 4 5% 17%	3575
	11th to 20th	Day	9% 13% 7% 19% 11% 8% 5% 2 4 4 20%	3570
	21st to end	Day	6% 10% 6% 19% 7% 6% 6% 3 5% 6% 25%	3960
February	1st to 10th	Day	9% 14% 5% 13% 10% 8% 7% 4 5% 5% 19%	1626
	11th to 20th	Day	12% 14% 8% 14% 8% 6% 5% 3 5% 4 21%	1791
	21st to end	Day	11% 15% 4 12% 8% 6% 4 3 6% 5% 26%	1570
March	1st to 10th	Day	17% 17% 5% 10% 6% 5% 4 4 4 5% 25%	3116
	11th to 20th	Day	15% 24% 4 11% 6% 5% 4 3 4 3 22%	3402
	21st to end	Day	16% 16% 6% 9% 5% 4 3 2 4 5% 31%	3942
April	1st to 10th	Day	21% 16% 4 9% 6% 4 4 2 4 5% 26%	2280
	11th to 20th	Day	17% 12% 3 8% 5% 4 4 4 4 5% 35%	2385
	21st to end	Day	23% 13% 3 7% 5% 4 3 3 4 6% 29%	2470
May	1st to 10th	Day	18% 9% 3 8% 7% 6% 5% 3 5% 6% 30%	4106
	11th to 20th	Day	20% 10% 3 8% 5% 5% 6% 4 6% 7% 26%	4357
	21st to end	Day	16% 7% 3 8% 6% 5% 6% 5% 7% 8% 30%	5021
June	1st to 10th	Day	21% 9% 3 7% 6% 5% 5% 4 6% 8% 26%	2850
	11th to 20th	Day	19% 7% 2 7% 5% 5% 5% 4 7% 8% 30%	2850
	21st to end	Day	22% 11% 4 9% 5% 5% 5% 4 6% 5% 24%	2850
July	1st to 10th	Day	14% 7% 3 9% 7% 7% 6% 5% 8% 8% 28%	4638
	11th to 20th	Day	15% 6% 3 7% 6% 6% 7% 5% 8% 8% 30%	4440
	21st to end	Day	15% 7% 2 6% 4 5% 5% 4 7% 7% 38%	4814
August	1st to 10th	Day	16% 7% 3 8% 5% 6% 7% 5% 8% 8% 28%	4281
	11th to 20th	Day	17% 8% 3 9% 6% 5% 6% 5% 7% 8% 25%	4045
	21st to end	Day	18% 7% 3 7% 5% 4 5% 3 5% 8% 35%	4437
September	1st to 10th	Day	16% 8% 3 7% 4 5% 4 4 6% 7% 36%	2256
	11th to 20th	Day	16% 7% 3 5% 4 4 4 2 5% 6% 43%	2090
	21st to end	Day	18% 8% 3 6% 4 4 4 4 5% 7% 36%	2090
October	1st to 10th	Day	19% 10% 3 7% 6% 4 4 4 6% 7% 32%	2077
	11th to 20th	Day	19% 13% 4 10% 4 5% 4 4 5% 6% 25%	1773
	21st to end	Day	22% 15% 4 11% 5% 4 4 3 4 6% 23%	1881
November	1st to 10th	Day	17% 15% 4 9% 6% 5% 4 3 5% 5% 28%	1761
	11th to 20th	Day	17% 13% 5% 10% 7% 4 5% 5% 5% 5% 24%	1761
	21st to end	Day	16% 18% 4 10% 7% 4 4 4 6% 6% 20%	1485
December	1st to 10th	Day	15% 16% 6% 14% 7% 5% 5% 3 4 5% 19%	2280
	11th to 20th	Day	16% 15% 6% 10% 6% 4 5% 3 4 5% 26%	2618
	21st to end	Day	16% 16% 5% 11% 6% 4 5% 3 5% 5% 23%	3476
January	1st to 10th	Night	12% 17% 7% 14% 8% 7% 6% 3 4 4 17%	6367
	11th to 20th	Night	7% 16% 7% 18% 10% 8% 5% 3 4 4 16%	6315
	21st to end	Night	6% 9% 7% 13% 7% 6% 6% 5% 7% 7% 26%	6996
February	1st to 10th	Night	8% 14% 5% 12% 9% 8% 5% 5% 5% 6% 24%	2665
	11th to 20th	Night	9% 14% 5% 14% 9% 6% 6% 4 6% 6% 21%	2274
	21st to end	Night	12% 13% 3 9% 8% 6% 5% 4 5% 6% 30%	1884
March	1st to 10th	Night	17% 16% 5% 7% 5% 4 6% 3 4 6% 27%	3724
	11th to 20th	Night	12% 15% 5% 13% 6% 6% 6% 4 4 5% 24%	3557
	21st to end	Night	18% 15% 4 9% 5% 5% 4 3 4 4 29%	3673
April	1st to 10th	Night	17% 14% 4 9% 5% 4 4 4 5% 5% 30%	1900
	11th to 20th	Night	16% 12% 3 8% 4 4 4 4 5% 7% 33%	1742
	21st to end	Night	20% 11% 3 7% 5% 4 4 3 5% 5% 32%	1710
May	1st to 10th	Night	21% 9% 2 7% 4 4 5% 4 6% 7% 32%	2834
	11th to 20th	Night	18% 9% 3 8% 5% 6% 5% 3 5% 5% 33%	2564
	21st to end	Night	16% 5% 3 6% 5% 4 5% 5% 7% 8% 38%	2558
June	1st to 10th	Night	21% 10% 2 7% 5% 5% 6% 4 6% 7% 28%	1330
	11th to 20th	Night	16% 6% 3 6% 5% 5% 4 4 6% 7% 37%	1330
	21st to end	Night	20% 8% 3 8% 5% 5% 5% 4 6% 6% 31%	1330
July	1st to 10th	Night	12% 7% 3 8% 6% 5% 6% 5% 6% 8% 34%	2324
	11th to 20th	Night	18% 5% 2 6% 4 6% 5% 4 6% 7% 36%	2520
	21st to end	Night	12% 6% 2 6% 5% 5% 4 4 6% 8% 43%	2739
August	1st to 10th	Night	19% 7% 3 7% 5% 5% 5% 4 5% 8% 34%	2616
	11th to 20th	Night	14% 6% 3 9% 6% 6% 6% 5% 6% 7% 32%	2782
	21st to end	Night	15% 6% 3 6% 4 5% 5% 3 6% 7% 41%	3215
September	1st to 10th	Night	14% 6% 2 6% 4 5% 5% 3 6% 8% 42%	1924
	11th to 20th	Night	15% 7% 2 5% 4 3 4 4 5% 6% 45%	2090
	21st to end	Night	16% 7% 2 5% 5% 5% 5% 4 6% 6% 40%	2090
October	1st to 10th	Night	17% 8% 2 6% 4 4 4 3 6% 7% 39%	2102
	11th to 20th	Night	20% 10% 3 6% 5% 4 5% 4 4 6% 32%	2403
	21st to end	Night	19% 13% 4 8% 4 5% 5% 4 5% 5% 29%	2717
November	1st to 10th	Night	15% 12% 4 7% 6% 5% 6% 5% 6% 7% 28%	2537
	11th to 20th	Night	16% 10% 4 10% 6% 5% 4 4 6% 6% 30%	2636
	21st to end	Night	16% 15% 5% 11% 7% 5% 4 4 5% 6% 23%	2910
December	1st to 10th	Night	13% 12% 6% 12% 10% 9% 6% 4 5% 6% 18%	4910
	11th to 20th	Night	19% 15% 4 11% 7% 5% 4 3 4 5% 22%	5591
	21st to end	Night	16% 17% 5% 10% 6% 4 4 3 4 4 27%	7502

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	71% 7% 7% 10% 5%	3576
	11th to 20th	Day	73% 6% 5% 10% 5% 1	3600
	21st to end	Day	61% 8% 5% 11% 14% 1	3960
February	1st to 10th	Day	69% 4 6% 11% 8% 2	1626
	11th to 20th	Day	68% 6% 8% 11% 7% 1	1800
	21st to end	Day	60% 6% 8% 16% 7% 3	1570
March	1st to 10th	Day	61% 6% 8% 12% 10% 2	3119
	11th to 20th	Day	66% 8% 9% 10% 6% 1	3402
	21st to end	Day	58% 4 6% 17% 12% 3	3942
April	1st to 10th	Day	62% 5% 8% 14% 8% 3	2280
	11th to 20th	Day	52% 6% 10% 20% 11% 2	2385
	21st to end	Day	58% 5% 8% 16% 10% 3	2470
May	1st to 10th	Day	53% 8% 11% 18% 9% 1	4120
	11th to 20th	Day	54% 10% 14% 15% 6% 1	4361
	21st to end	Day	49% 11% 12% 18% 10%	5021
June	1st to 10th	Day	56% 8% 11% 18% 7%	2850
	11th to 20th	Day	49% 9% 13% 20% 9% 1	2850
	21st to end	Day	61% 8% 8% 15% 7%	2850
July	1st to 10th	Day	52% 9% 14% 19% 6%	4566
	11th to 20th	Day	47% 10% 17% 23% 3	4365
	21st to end	Day	44% 8% 15% 26% 7%	4661
August	1st to 10th	Day	52% 10% 16% 19% 4	4267
	11th to 20th	Day	54% 11% 16% 14% 4	4084
	21st to end	Day	47% 7% 15% 19% 11% 1	4437
September	1st to 10th	Day	45% 8% 15% 21% 10% 1	2256
	11th to 20th	Day	42% 6% 11% 28% 12% 1	2090
	21st to end	Day	46% 8% 12% 23% 11%	2090
October	1st to 10th	Day	55% 6% 11% 22% 6%	3454
	11th to 20th	Day	56% 6% 12% 23% 4	2924
	21st to end	Day	51% 6% 16% 19% 9%	3081
November	1st to 10th	Day	58% 7% 11% 17% 7%	1761
	11th to 20th	Day	62% 7% 10% 14% 7% 1	1761
	21st to end	Day	66% 8% 9% 13% 4	1485
December	1st to 10th	Day	70% 6% 7% 9% 7%	2280
	11th to 20th	Day	61% 7% 9% 13% 10%	2618
	21st to end	Day	65% 6% 7% 10% 11% 2	3476
January	1st to 10th	Night	73% 8% 7% 8% 4	6367
	11th to 20th	Night	74% 8% 6% 9% 3 1	6360
	21st to end	Night	56% 8% 9% 14% 13% 1	6996
February	1st to 10th	Night	63% 6% 9% 12% 9% 1	2665
	11th to 20th	Night	66% 7% 8% 12% 7% 1	2276
	21st to end	Night	56% 6% 9% 16% 11% 2	1884
March	1st to 10th	Night	61% 7% 9% 15% 7% 2	3734
	11th to 20th	Night	62% 9% 11% 10% 6% 1	3558
	21st to end	Night	61% 4 6% 18% 9% 2	3673
April	1st to 10th	Night	58% 5% 7% 15% 12% 3	1900
	11th to 20th	Night	52% 5% 10% 20% 12% 1	1742
	21st to end	Night	55% 7% 9% 17% 10% 2	1710
May	1st to 10th	Night	48% 9% 14% 20% 8% 1	2840
	11th to 20th	Night	50% 10% 13% 18% 8% 1	2565
	21st to end	Night	41% 10% 16% 19% 13%	2559
June	1st to 10th	Night	55% 8% 13% 18% 6%	1330
	11th to 20th	Night	45% 8% 13% 21% 11% 1	1330
	21st to end	Night	54% 10% 13% 15% 8%	1330
July	1st to 10th	Night	46% 10% 19% 19% 7%	2286
	11th to 20th	Night	48% 8% 20% 20% 5%	2472
	21st to end	Night	40% 10% 19% 26% 6%	2651
August	1st to 10th	Night	50% 7% 17% 23% 2	2606
	11th to 20th	Night	49% 11% 18% 16% 5%	2809
	21st to end	Night	42% 8% 15% 21% 13%	3215
September	1st to 10th	Night	41% 7% 15% 26% 10% 1	1924
	11th to 20th	Night	41% 6% 17% 26% 10%	2090
	21st to end	Night	45% 8% 12% 23% 13%	2090
October	1st to 10th	Night	46% 7% 12% 26% 9%	3505
	11th to 20th	Night	54% 5% 11% 24% 5%	3991
	21st to end	Night	49% 6% 17% 18% 9%	4467
November	1st to 10th	Night	56% 9% 13% 17% 5%	2537
	11th to 20th	Night	56% 8% 11% 15% 9% 1	2636
	21st to end	Night	64% 7% 12% 12% 4	2910
December	1st to 10th	Night	72% 7% 9% 9% 2	4910
	11th to 20th	Night	67% 5% 8% 15% 5%	5592
	21st to end	Night	63% 5% 7% 14% 11% 1	7502

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	27% 35% 29% 7% 2 1	200
	11th to 20th	Day	29% 26% 33% 11% 2 1	200
	21st to end	Day	21% 27% 36% 12% 4	220
February	1st to 10th	Day	30% 25% 34% 8% 2	256
	11th to 20th	Day	26% 29% 35% 8% 2	429
	21st to end	Day	26% 27% 33% 11% 3	382
March	1st to 10th	Day	28% 26% 30% 13% 3	460
	11th to 20th	Day	26% 27% 29% 12% 5%	460
	21st to end	Day	31% 23% 25% 15% 5% 1	506
April	1st to 10th	Day	36% 21% 25% 13% 5%	460
	11th to 20th	Day	32% 24% 26% 13% 4 1	452
	21st to end	Day	35% 18% 32% 11% 3 1	460
May	1st to 10th	Day	32% 15% 36% 12% 4 2	463
	11th to 20th	Day	27% 18% 31% 17% 5% 1	487
	21st to end	Day	23% 23% 34% 15% 6%	635
June	1st to 10th	Day	26% 18% 33% 16% 6% 1	680
	11th to 20th	Day	23% 17% 27% 24% 8% 1	680
	21st to end	Day	28% 15% 28% 19% 8% 1	680
July	1st to 10th	Day	20% 14% 38% 19% 8% 1	603
	11th to 20th	Day	19% 15% 39% 19% 7% 1	484
	21st to end	Day	18% 13% 37% 25% 7% 1	532
August	1st to 10th	Day	20% 15% 33% 23% 7% 1	486
	11th to 20th	Day	19% 12% 31% 26% 9% 2	479
	21st to end	Day	22% 15% 29% 20% 9% 4	539
September	1st to 10th	Day	19% 17% 30% 22% 9% 2	490
	11th to 20th	Day	24% 10% 31% 21% 11% 3	490
	21st to end	Day	23% 14% 29% 19% 11% 4	490
October	1st to 10th	Day	23% 19% 25% 20% 10% 3	483
	11th to 20th	Day	32% 19% 26% 12% 9% 1	390
	21st to end	Day	35% 23% 27% 12% 3	429
November	1st to 10th	Day	34% 17% 31% 14% 3 1	395
	11th to 20th	Day	28% 24% 28% 15% 6% 1	400
	21st to end	Day	33% 28% 25% 12% 2 1	285
December	1st to 10th	Day	33% 20% 32% 12% 4 1	200
	11th to 20th	Day	34% 29% 28% 7% 2 1	200
	21st to end	Day	35% 26% 21% 14% 3	220
January	1st to 10th	Night	26% 27% 35% 11% 1	803
	11th to 20th	Night	26% 25% 34% 13% 2	800
	21st to end	Night	17% 24% 39% 18% 3	880
February	1st to 10th	Night	20% 28% 35% 14% 3	781
	11th to 20th	Night	23% 25% 36% 13% 2	743
	21st to end	Night	24% 19% 39% 15% 3	628
March	1st to 10th	Night	25% 18% 37% 17% 2	760
	11th to 20th	Night	23% 23% 34% 15% 5% 1	760
	21st to end	Night	24% 20% 30% 21% 5%	836
April	1st to 10th	Night	30% 18% 31% 17% 5%	760
	11th to 20th	Night	25% 18% 31% 20% 5%	618
	21st to end	Night	32% 14% 28% 19% 7%	570
May	1st to 10th	Night	26% 13% 31% 23% 6%	570
	11th to 20th	Night	24% 11% 31% 27% 7% 1	417
	21st to end	Night	22% 13% 32% 25% 8%	411
June	1st to 10th	Night	27% 8% 32% 24% 7% 1	380
	11th to 20th	Night	18% 9% 30% 32% 9% 1	380
	21st to end	Night	22% 8% 35% 28% 7% 1	380
July	1st to 10th	Night	15% 9% 36% 29% 11% 1	370
	11th to 20th	Night	16% 7% 32% 36% 10%	368
	21st to end	Night	18% 7% 31% 35% 9%	416
August	1st to 10th	Night	17% 5% 29% 35% 13% 1	436
	11th to 20th	Night	15% 8% 30% 32% 13% 1	562
	21st to end	Night	15% 7% 32% 32% 12% 2	679
September	1st to 10th	Night	16% 10% 34% 28% 10% 1	760
	11th to 20th	Night	20% 10% 29% 27% 13% 2	760
	21st to end	Night	21% 12% 30% 22% 14% 1	760
October	1st to 10th	Night	24% 14% 28% 25% 9% 1	760
	11th to 20th	Night	28% 14% 31% 19% 7% 1	760
	21st to end	Night	31% 20% 30% 16% 4	836
November	1st to 10th	Night	29% 19% 29% 19% 4	780
	11th to 20th	Night	26% 21% 29% 16% 7%	818
	21st to end	Night	27% 23% 31% 15% 3 1	900
December	1st to 10th	Night	30% 20% 33% 12% 4	900
	11th to 20th	Night	29% 25% 26% 15% 5%	900
	21st to end	Night	29% 25% 29% 14% 3 1	990

Page generated at 2025-02-03 03:05:50. Version ac07

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