Livingston
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Livingston clear sky chart from 2005-11-06 to 2024-11-11.

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	5% 7% 2 6% 5% 5% 5% 5% 7% 8% 45%	105479
	Night	5% 8% 3 7% 5% 4 5% 4 7% 8% 45%	102369
Transparency	Day	36% 9% 14% 21% 15% 5%	105218
	Night	36% 10% 16% 22% 13% 3	102220
Seeing	Day	14% 18% 31% 23% 12% 2	15556
	Night	10% 16% 32% 30% 11% 1	25052

By Month

Percentage Cloud Cover SW (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	1 8% 4 10% 6% 5% 6% 6% 8% 12% 34%	2219
	11th to 20th	Day	1 7% 4 12% 7% 7% 6% 6% 7% 11% 32%	2448
	21st to end	Day	1 7% 3 7% 6% 5% 5% 4 6% 9% 47%	3146
February	1st to 10th	Day	3 11% 4 9% 7% 6% 6% 6% 7% 9% 31%	1710
	11th to 20th	Day	1 10% 5% 12% 7% 6% 6% 5% 8% 9% 32%	1665
	21st to end	Day	2 10% 3 10% 8% 7% 8% 6% 8% 9% 29%	1461
March	1st to 10th	Day	2 8% 3 8% 5% 5% 6% 5% 6% 8% 45%	3375
	11th to 20th	Day	2 10% 3 8% 4 4 4 4 6% 7% 48%	3490
	21st to end	Day	6% 14% 5% 11% 7% 7% 7% 6% 8% 9% 22%	3825
April	1st to 10th	Day	6% 13% 3 8% 6% 5% 5% 5% 8% 10% 31%	2214
	11th to 20th	Day	6% 11% 4 10% 7% 5% 5% 4 7% 8% 31%	2410
	21st to end	Day	12% 13% 3 8% 5% 5% 5% 4 8% 8% 30%	2470
May	1st to 10th	Day	13% 17% 4 8% 4 4 5% 4 5% 7% 29%	4110
	11th to 20th	Day	9% 10% 3 7% 5% 5% 5% 5% 8% 9% 34%	4385
	21st to end	Day	13% 8% 2 6% 4 4 5% 4 6% 8% 36%	4825
June	1st to 10th	Day	12% 6% 2 6% 5% 4 6% 5% 8% 10% 36%	2828
	11th to 20th	Day	8% 7% 2 7% 6% 6% 5% 6% 7% 8% 38%	2850
	21st to end	Day	4 3 1 4 4 4 5% 5% 7% 9% 55%	2850
July	1st to 10th	Day	3 2 1 2 3 3 4 4 7% 8% 63%	4740
	11th to 20th	Day	2 2 1 3 3 4 5% 4 6% 7% 64%	4740
	21st to end	Day	2 2 1 4 4 4 6% 4 6% 7% 61%	4545
August	1st to 10th	Day	4 4 1 5% 4 4 5% 4 8% 9% 52%	4092
	11th to 20th	Day	4 3 1 3 4 5% 6% 5% 6% 7% 57%	4028
	21st to end	Day	4 3 1 4 3 4 4 4 6% 7% 60%	4500
September	1st to 10th	Day	6% 4 1 4 3 3 3 3 6% 6% 61%	2280
	11th to 20th	Day	7% 5% 2 5% 4 4 5% 4 6% 6% 52%	2112
	21st to end	Day	8% 5% 1 4 3 3 4 4 5% 7% 55%	2090
October	1st to 10th	Day	6% 6% 2 6% 3 3 3 2 4 4 62%	3184
	11th to 20th	Day	7% 7% 2 4 3 3 3 3 3 6% 59%	3150
	21st to end	Day	5% 7% 3 7% 4 5% 6% 5% 6% 7% 45%	3323
November	1st to 10th	Day	5% 8% 3 9% 5% 5% 6% 5% 5% 8% 41%	1645
	11th to 20th	Day	4 8% 3 7% 5% 6% 6% 5% 7% 8% 41%	1520
	21st to end	Day	3 9% 3 5% 5% 4 6% 5% 7% 8% 45%	1520
December	1st to 10th	Day	1 6% 4 8% 6% 6% 5% 6% 8% 9% 41%	1520
	11th to 20th	Day	2 7% 2 7% 5% 5% 7% 7% 10% 12% 37%	1767
	21st to end	Day	2 9% 3 9% 5% 6% 5% 5% 6% 8% 42%	2442
January	1st to 10th	Night	1 5% 4 8% 6% 6% 6% 5% 8% 10% 42%	4726
	11th to 20th	Night	1 5% 3 13% 8% 8% 8% 6% 7% 8% 33%	4540
	21st to end	Night	2 7% 3 8% 5% 5% 6% 5% 8% 10% 42%	4521
February	1st to 10th	Night	3 12% 6% 12% 7% 5% 7% 6% 8% 7% 28%	2470
	11th to 20th	Night	3 11% 5% 11% 7% 7% 5% 5% 7% 7% 33%	2402
	21st to end	Night	2 10% 5% 11% 7% 6% 5% 5% 8% 7% 34%	1989
March	1st to 10th	Night	2 7% 4 9% 5% 5% 5% 5% 6% 8% 44%	3499
	11th to 20th	Night	2 9% 3 7% 4 4 4 4 6% 8% 49%	3490
	21st to end	Night	5% 16% 7% 12% 6% 5% 6% 5% 6% 7% 25%	3828
April	1st to 10th	Night	9% 13% 4 8% 5% 4 5% 4 5% 6% 37%	1964
	11th to 20th	Night	5% 12% 3 9% 5% 5% 7% 5% 7% 8% 34%	1715
	21st to end	Night	13% 13% 3 7% 4 4 4 4 5% 7% 37%	1710
May	1st to 10th	Night	17% 13% 5% 8% 5% 4 4 3 5% 7% 29%	2860
	11th to 20th	Night	9% 11% 3 7% 5% 5% 4 4 6% 7% 39%	2517
	21st to end	Night	13% 10% 3 7% 5% 4 5% 4 7% 10% 32%	2762
June	1st to 10th	Night	11% 5% 1 7% 5% 6% 6% 5% 7% 8% 37%	1348
	11th to 20th	Night	11% 7% 2 6% 4 5% 5% 5% 8% 8% 40%	1330
	21st to end	Night	5% 3 2 3 4 3 4 3 8% 7% 56%	1330
July	1st to 10th	Night	4 4 2 5% 4 4 4 4 6% 7% 56%	2220
	11th to 20th	Night	2 3 1 3 3 3 4 3 6% 8% 65%	2220
	21st to end	Night	1 2 1 4 4 4 4 4 7% 9% 60%	2999
August	1st to 10th	Night	3 4 2 4 3 4 5% 5% 8% 9% 52%	2847
	11th to 20th	Night	3 2 1 4 4 4 6% 5% 8% 8% 54%	2811
	21st to end	Night	5% 3 1 3 3 3 3 3 6% 6% 64%	3167
September	1st to 10th	Night	5% 5% 2 5% 3 3 4 4 5% 8% 57%	1900
	11th to 20th	Night	8% 6% 2 4 3 3 4 3 7% 9% 52%	2065
	21st to end	Night	10% 7% 2 4 3 3 2 2 4 6% 57%	2090
October	1st to 10th	Night	7% 6% 2 3 2 2 3 2 4 5% 64%	3785
	11th to 20th	Night	7% 8% 2 5% 3 3 3 3 4 7% 55%	3778
	21st to end	Night	6% 8% 2 5% 3 3 5% 4 6% 9% 48%	4231
November	1st to 10th	Night	5% 8% 3 6% 5% 4 5% 4 7% 9% 43%	2633
	11th to 20th	Night	4 9% 3 7% 5% 5% 4 5% 7% 8% 44%	2667
	21st to end	Night	3 7% 3 7% 4 4 4 4 8% 9% 48%	2660
December	1st to 10th	Night	2 8% 4 9% 7% 5% 6% 5% 7% 7% 41%	2660
	11th to 20th	Night	3 6% 2 7% 4 4 5% 6% 8% 10% 45%	3421
	21st to end	Night	2 7% 4 8% 4 4 5% 4 6% 8% 47%	5214

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	38% 14% 19% 24% 5%	2219
	11th to 20th	Day	42% 16% 17% 12% 11% 2	2448
	21st to end	Day	35% 13% 21% 23% 9% 1	3146
February	1st to 10th	Day	54% 10% 13% 16% 5%	1710
	11th to 20th	Day	52% 9% 15% 18% 5% 1	1674
	21st to end	Day	51% 13% 12% 13% 9% 2	1461
March	1st to 10th	Day	35% 10% 15% 26% 13% 1	3375
	11th to 20th	Day	35% 11% 23% 25% 6%	3490
	21st to end	Day	53% 17% 17% 11% 2	3825
April	1st to 10th	Day	49% 11% 15% 20% 5%	2214
	11th to 20th	Day	51% 10% 16% 17% 6%	2413
	21st to end	Day	53% 9% 14% 18% 6%	2470
May	1st to 10th	Day	52% 11% 12% 20% 5% 1	4110
	11th to 20th	Day	38% 14% 17% 22% 8% 1	4389
	21st to end	Day	41% 12% 21% 20% 5%	4825
June	1st to 10th	Day	42% 12% 18% 20% 7% 1	2828
	11th to 20th	Day	43% 10% 14% 18% 13% 2	2850
	21st to end	Day	24% 9% 17% 25% 21% 5%	2850
July	1st to 10th	Day	17% 6% 11% 25% 30% 11%	4666
	11th to 20th	Day	18% 4 9% 18% 27% 24%	4659
	21st to end	Day	22% 5% 9% 17% 29% 18%	4401
August	1st to 10th	Day	27% 7% 13% 20% 20% 13%	4078
	11th to 20th	Day	25% 5% 10% 28% 26% 5%	4067
	21st to end	Day	23% 5% 9% 27% 26% 11%	4499
September	1st to 10th	Day	24% 4 11% 21% 28% 11%	2280
	11th to 20th	Day	30% 7% 14% 21% 21% 6%	2112
	21st to end	Day	29% 6% 12% 28% 19% 6%	2090
October	1st to 10th	Day	29% 4 7% 18% 33% 9%	3184
	11th to 20th	Day	31% 4 15% 29% 17% 3	3150
	21st to end	Day	40% 6% 15% 27% 11% 2	3323
November	1st to 10th	Day	43% 9% 14% 21% 10% 2	1645
	11th to 20th	Day	42% 11% 18% 20% 8% 2	1520
	21st to end	Day	39% 8% 16% 23% 13% 1	1520
December	1st to 10th	Day	40% 11% 20% 18% 8% 3	1520
	11th to 20th	Day	38% 16% 24% 18% 3 1	1765
	21st to end	Day	41% 9% 9% 23% 9% 9%	2442
January	1st to 10th	Night	36% 13% 23% 22% 6% 1	4726
	11th to 20th	Night	48% 13% 14% 17% 7% 2	4540
	21st to end	Night	37% 15% 20% 20% 7% 1	4521
February	1st to 10th	Night	54% 11% 14% 15% 6%	2470
	11th to 20th	Night	51% 10% 15% 16% 7% 1	2403
	21st to end	Night	48% 10% 15% 16% 8% 2	1989
March	1st to 10th	Night	34% 12% 15% 25% 13% 1	3499
	11th to 20th	Night	30% 13% 23% 28% 5% 1	3490
	21st to end	Night	52% 17% 17% 12% 2	3828
April	1st to 10th	Night	47% 9% 16% 20% 7%	1964
	11th to 20th	Night	46% 12% 15% 21% 6%	1715
	21st to end	Night	49% 8% 17% 20% 5%	1710
May	1st to 10th	Night	52% 11% 15% 17% 4	2860
	11th to 20th	Night	38% 13% 16% 24% 8% 2	2518
	21st to end	Night	41% 14% 19% 24% 3	2762
June	1st to 10th	Night	41% 14% 18% 20% 6%	1348
	11th to 20th	Night	41% 10% 16% 20% 11% 2	1330
	21st to end	Night	23% 9% 15% 28% 19% 5%	1330
July	1st to 10th	Night	26% 6% 12% 25% 28% 3	2185
	11th to 20th	Night	17% 4 10% 21% 30% 18%	2178
	21st to end	Night	20% 5% 11% 26% 26% 12%	2906
August	1st to 10th	Night	24% 10% 14% 24% 19% 9%	2838
	11th to 20th	Night	25% 8% 12% 29% 22% 5%	2838
	21st to end	Night	20% 5% 10% 30% 28% 7%	3167
September	1st to 10th	Night	26% 5% 11% 20% 26% 11%	1900
	11th to 20th	Night	27% 8% 16% 24% 20% 5%	2065
	21st to end	Night	31% 4 12% 28% 21% 4	2090
October	1st to 10th	Night	25% 5% 9% 23% 31% 7%	3785
	11th to 20th	Night	33% 6% 11% 28% 18% 4	3778
	21st to end	Night	35% 6% 15% 24% 17% 3	4231
November	1st to 10th	Night	39% 9% 18% 22% 10% 2	2633
	11th to 20th	Night	41% 9% 20% 22% 7% 1	2667
	21st to end	Night	35% 7% 20% 23% 12% 2	2660
December	1st to 10th	Night	43% 12% 18% 17% 9% 2	2660
	11th to 20th	Night	35% 12% 25% 22% 5%	3422
	21st to end	Night	35% 10% 14% 24% 8% 9%	5214

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	21% 18% 37% 17% 7%	180
	11th to 20th	Day	16% 27% 31% 17% 7% 2	191
	21st to end	Day	13% 24% 47% 10% 3 2	297
February	1st to 10th	Day	22% 28% 35% 11% 4	270
	11th to 20th	Day	17% 30% 35% 13% 3 1	270
	21st to end	Day	21% 27% 33% 15% 3 1	273
March	1st to 10th	Day	16% 28% 37% 16% 3 1	460
	11th to 20th	Day	15% 25% 32% 18% 8% 2	460
	21st to end	Day	20% 23% 33% 17% 6% 2	506
April	1st to 10th	Day	22% 24% 37% 13% 4	460
	11th to 20th	Day	17% 28% 32% 18% 4	452
	21st to end	Day	23% 22% 27% 17% 8% 2	460
May	1st to 10th	Day	18% 19% 27% 25% 9% 2	463
	11th to 20th	Day	22% 14% 23% 22% 14% 4	672
	21st to end	Day	19% 14% 24% 22% 18% 3	734
June	1st to 10th	Day	13% 15% 25% 25% 18% 4	680
	11th to 20th	Day	16% 22% 28% 22% 10% 1	680
	21st to end	Day	8% 9% 28% 36% 17% 2	680
July	1st to 10th	Day	5% 10% 26% 33% 22% 4	671
	11th to 20th	Day	4 9% 32% 34% 20% 1	668
	21st to end	Day	4 8% 32% 34% 18% 4	585
August	1st to 10th	Day	9% 9% 33% 32% 14% 3	487
	11th to 20th	Day	7% 8% 28% 36% 18% 3	477
	21st to end	Day	7% 12% 34% 25% 19% 4	539
September	1st to 10th	Day	6% 14% 33% 29% 14% 4	490
	11th to 20th	Day	13% 14% 32% 28% 11% 2	490
	21st to end	Day	16% 17% 28% 24% 13% 2	490
October	1st to 10th	Day	15% 17% 28% 23% 12% 5%	314
	11th to 20th	Day	18% 20% 31% 16% 9% 5%	300
	21st to end	Day	19% 27% 29% 16% 7% 2	330
November	1st to 10th	Day	17% 24% 33% 18% 7% 2	300
	11th to 20th	Day	14% 30% 40% 11% 4	270
	21st to end	Day	16% 24% 39% 17% 4	270
December	1st to 10th	Day	16% 31% 31% 16% 6%	270
	11th to 20th	Day	21% 31% 33% 13% 2	219
	21st to end	Day	20% 25% 31% 17% 7% 1	198
January	1st to 10th	Night	9% 22% 42% 22% 5%	950
	11th to 20th	Night	10% 25% 39% 18% 6% 1	852
	21st to end	Night	7% 23% 47% 16% 5%	836
February	1st to 10th	Night	10% 26% 38% 21% 5%	760
	11th to 20th	Night	10% 21% 46% 17% 6% 1	744
	21st to end	Night	12% 20% 38% 23% 5% 1	628
March	1st to 10th	Night	8% 18% 39% 27% 7% 1	760
	11th to 20th	Night	9% 17% 32% 32% 10% 1	760
	21st to end	Night	12% 15% 33% 31% 9% 1	836
April	1st to 10th	Night	15% 15% 37% 25% 7% 1	634
	11th to 20th	Night	11% 15% 37% 30% 6%	563
	21st to end	Night	18% 14% 25% 30% 13% 1	570
May	1st to 10th	Night	16% 11% 25% 33% 14%	570
	11th to 20th	Night	19% 10% 19% 32% 19% 1	561
	21st to end	Night	19% 9% 20% 29% 21% 1	617
June	1st to 10th	Night	13% 9% 19% 38% 20% 1	398
	11th to 20th	Night	12% 11% 29% 38% 10% 1	380
	21st to end	Night	7% 5% 18% 48% 23% 1	380
July	1st to 10th	Night	7% 2 11% 48% 30% 2	370
	11th to 20th	Night	3 5% 18% 53% 20%	368
	21st to end	Night	3 4 23% 46% 23% 1	610
August	1st to 10th	Night	4 4 19% 51% 20% 1	567
	11th to 20th	Night	5% 4 19% 49% 22% 1	564
	21st to end	Night	7% 6% 20% 43% 23% 1	627
September	1st to 10th	Night	7% 4 21% 45% 21% 2	570
	11th to 20th	Night	9% 7% 19% 41% 21% 3	735
	21st to end	Night	14% 9% 23% 35% 18% 1	760
October	1st to 10th	Night	15% 10% 24% 35% 14% 2	760
	11th to 20th	Night	14% 13% 34% 26% 11% 2	760
	21st to end	Night	10% 19% 35% 26% 8% 1	836
November	1st to 10th	Night	11% 20% 40% 22% 7% 1	878
	11th to 20th	Night	14% 21% 40% 22% 3	953
	21st to end	Night	7% 21% 42% 25% 4 1	950
December	1st to 10th	Night	8% 24% 38% 25% 5% 1	950
	11th to 20th	Night	10% 24% 41% 20% 4 1	950
	21st to end	Night	10% 24% 40% 19% 7%	1045

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