Little River
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little River clear sky chart from 2005-11-06 to 2024-01-15.

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	11% 5% 2 5% 5% 3 5% 5% 6% 8% 43%	75000
	Night	11% 6% 2 5% 5% 3 5% 5% 6% 8% 44%	74777
Transparency	Day	36% 9% 15% 20% 16% 4	74722
	Night	37% 8% 13% 19% 18% 5%	74574
Seeing	Day	14% 9% 24% 27% 18% 8%	14560
	Night	14% 8% 23% 32% 20% 3	24724

By Month

Percentage Cloud Cover SE (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% 5% 3 5% 5% 3 3 4 5% 6% 47%	1706
	11th to 20th	Day	12% 5% 4 6% 5% 3 5% 6% 4 6% 44%	1656
	21st to end	Day	16% 5% 3 5% 5% 3 4 4 4 6% 46%	1782
February	1st to 10th	Day	16% 6% 2 7% 4 3 5% 4 5% 6% 41%	1620
	11th to 20th	Day	18% 6% 2 4 4 2 4 3 5% 5% 47%	1647
	21st to end	Day	16% 6% 3 5% 5% 2 4 5% 5% 7% 42%	1628
March	1st to 10th	Day	12% 6% 2 5% 3 2 3 4 4 5% 53%	1980
	11th to 20th	Day	13% 6% 2 6% 6% 3 5% 5% 5% 7% 41%	1980
	21st to end	Day	13% 5% 2 5% 6% 3 5% 6% 5% 8% 43%	2178
April	1st to 10th	Day	9% 4 2 4 4 2 5% 5% 6% 7% 52%	2088
	11th to 20th	Day	9% 4 2 4 5% 2 5% 4 5% 8% 53%	2134
	21st to end	Day	7% 3 2 4 4 3 5% 5% 5% 8% 54%	2160
May	1st to 10th	Day	6% 4 2 4 5% 3 5% 5% 7% 10% 51%	2213
	11th to 20th	Day	11% 5% 2 6% 5% 3 4 5% 7% 8% 45%	2301
	21st to end	Day	10% 5% 2 4 5% 3 6% 6% 8% 10% 41%	2531
June	1st to 10th	Day	10% 6% 4 6% 6% 4 6% 6% 8% 11% 34%	2340
	11th to 20th	Day	9% 5% 3 5% 4 3 6% 7% 8% 12% 40%	2340
	21st to end	Day	7% 5% 2 5% 6% 4 6% 7% 8% 14% 35%	2340
July	1st to 10th	Day	8% 5% 3 6% 6% 4 6% 8% 8% 11% 34%	2340
	11th to 20th	Day	8% 4 3 5% 5% 4 7% 8% 10% 12% 35%	2340
	21st to end	Day	6% 4 2 5% 6% 4 8% 7% 9% 12% 35%	2547
August	1st to 10th	Day	9% 5% 3 6% 6% 4 7% 8% 9% 12% 31%	2327
	11th to 20th	Day	10% 6% 3 6% 6% 4 6% 6% 9% 11% 33%	2172
	21st to end	Day	10% 6% 3 7% 7% 4 7% 7% 8% 11% 31%	2376
September	1st to 10th	Day	9% 4 3 5% 6% 4 5% 6% 7% 10% 41%	2160
	11th to 20th	Day	13% 6% 2 6% 5% 3 6% 6% 6% 9% 37%	2046
	21st to end	Day	14% 7% 4 6% 6% 3 5% 4 5% 7% 39%	1934
October	1st to 10th	Day	12% 5% 2 6% 5% 3 4 6% 5% 6% 46%	1800
	11th to 20th	Day	9% 4 2 5% 4 2 4 3 5% 7% 56%	1800
	21st to end	Day	10% 4 2 4 4 3 3 3 4 6% 58%	1980
November	1st to 10th	Day	12% 4 2 4 4 2 3 4 4 5% 55%	1857
	11th to 20th	Day	12% 5% 2 5% 5% 2 4 3 4 6% 51%	1900
	21st to end	Day	11% 5% 2 5% 5% 3 4 4 4 7% 51%	1810
December	1st to 10th	Day	14% 6% 3 6% 6% 4 5% 5% 7% 7% 38%	1710
	11th to 20th	Day	15% 5% 2 3 4 2 3 3 4 5% 55%	2153
	21st to end	Day	15% 8% 3 6% 5% 3 4 4 5% 6% 41%	3124
January	1st to 10th	Night	13% 7% 3 6% 5% 3 4 4 4 6% 46%	2459
	11th to 20th	Night	11% 6% 2 4 5% 3 5% 5% 6% 7% 46%	2393
	21st to end	Night	15% 5% 2 5% 5% 3 4 4 5% 6% 45%	2574
February	1st to 10th	Night	17% 5% 3 4 5% 3 3 4 5% 7% 44%	2340
	11th to 20th	Night	18% 6% 3 5% 4 2 4 4 5% 6% 43%	2191
	21st to end	Night	16% 6% 4 5% 5% 3 5% 4 5% 7% 42%	1628
March	1st to 10th	Night	13% 5% 2 4 4 3 4 3 4 8% 50%	1980
	11th to 20th	Night	13% 6% 2 6% 6% 4 5% 4 6% 8% 41%	1980
	21st to end	Night	11% 5% 3 5% 4 3 4 4 4 8% 48%	2178
April	1st to 10th	Night	10% 6% 3 5% 4 3 4 4 5% 8% 49%	1871
	11th to 20th	Night	10% 5% 2 5% 4 3 5% 4 5% 8% 48%	1775
	21st to end	Night	6% 5% 2 4 5% 3 4 4 5% 9% 54%	1800
May	1st to 10th	Night	7% 4 3 4 5% 3 5% 4 6% 10% 49%	1762
	11th to 20th	Night	12% 5% 3 5% 4 3 5% 5% 5% 10% 44%	1592
	21st to end	Night	10% 5% 2 4 5% 2 5% 6% 6% 10% 45%	1744
June	1st to 10th	Night	10% 6% 4 7% 6% 3 5% 5% 9% 10% 35%	1620
	11th to 20th	Night	9% 5% 2 5% 5% 4 5% 5% 8% 11% 42%	1620
	21st to end	Night	7% 5% 2 5% 5% 5% 7% 7% 8% 14% 34%	1620
July	1st to 10th	Night	7% 6% 3 6% 6% 4 6% 7% 8% 12% 35%	1620
	11th to 20th	Night	7% 5% 3 6% 5% 4 6% 8% 7% 12% 36%	1620
	21st to end	Night	7% 5% 2 5% 6% 4 6% 7% 7% 12% 38%	1771
August	1st to 10th	Night	8% 5% 3 5% 6% 3 6% 7% 10% 12% 35%	1611
	11th to 20th	Night	7% 6% 2 6% 8% 4 7% 6% 9% 12% 31%	1709
	21st to end	Night	10% 4 3 6% 7% 3 6% 7% 9% 11% 33%	1980
September	1st to 10th	Night	8% 5% 3 5% 5% 3 5% 7% 8% 10% 41%	1800
	11th to 20th	Night	11% 6% 3 5% 6% 4 5% 6% 6% 9% 39%	1909
	21st to end	Night	15% 8% 3 6% 5% 3 4 4 5% 7% 39%	2024
October	1st to 10th	Night	11% 6% 2 5% 5% 3 5% 4 5% 6% 48%	2160
	11th to 20th	Night	9% 4 2 5% 4 3 4 3 5% 7% 54%	2160
	21st to end	Night	9% 5% 2 4 5% 2 3 4 5% 7% 54%	2376
November	1st to 10th	Night	11% 5% 2 4 5% 2 4 3 4 6% 56%	2221
	11th to 20th	Night	12% 6% 3 5% 5% 3 4 3 4 6% 49%	2280
	21st to end	Night	10% 5% 2 4 4 3 4 4 6% 8% 49%	2365
December	1st to 10th	Night	16% 6% 2 6% 5% 3 4 5% 5% 7% 41%	2470
	11th to 20th	Night	16% 6% 2 5% 4 2 3 4 4 5% 50%	3042
	21st to end	Night	16% 6% 2 5% 5% 3 4 4 5% 7% 43%	4532

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	37% 5% 12% 18% 21% 7%	1707
	11th to 20th	Day	40% 6% 8% 17% 23% 6%	1656
	21st to end	Day	41% 5% 6% 19% 23% 6%	1782
February	1st to 10th	Day	43% 6% 10% 19% 19% 4	1620
	11th to 20th	Day	41% 5% 7% 19% 21% 7%	1656
	21st to end	Day	40% 7% 10% 17% 16% 9%	1628
March	1st to 10th	Day	34% 4 10% 20% 23% 8%	1980
	11th to 20th	Day	41% 8% 12% 19% 16% 6%	1980
	21st to end	Day	38% 8% 13% 20% 17% 4	2178
April	1st to 10th	Day	30% 6% 14% 20% 24% 6%	2088
	11th to 20th	Day	30% 5% 13% 24% 18% 10%	2134
	21st to end	Day	26% 9% 14% 24% 23% 4	2160
May	1st to 10th	Day	27% 8% 17% 28% 17% 3	2213
	11th to 20th	Day	34% 9% 20% 23% 14% 1	2305
	21st to end	Day	33% 13% 19% 23% 13%	2531
June	1st to 10th	Day	41% 11% 16% 22% 9%	2340
	11th to 20th	Day	31% 14% 21% 23% 10% 1	2340
	21st to end	Day	35% 14% 22% 21% 8% 1	2340
July	1st to 10th	Day	38% 13% 22% 19% 6% 1	2275
	11th to 20th	Day	35% 16% 24% 19% 6% 1	2271
	21st to end	Day	34% 14% 25% 23% 4 1	2405
August	1st to 10th	Day	37% 16% 23% 20% 3	2314
	11th to 20th	Day	39% 15% 22% 17% 6%	2172
	21st to end	Day	41% 14% 21% 17% 5% 1	2376
September	1st to 10th	Day	34% 13% 18% 18% 14% 3	2160
	11th to 20th	Day	40% 11% 14% 15% 15% 4	2046
	21st to end	Day	43% 7% 13% 18% 15% 3	1934
October	1st to 10th	Day	38% 6% 10% 19% 23% 4	1800
	11th to 20th	Day	29% 6% 10% 25% 24% 8%	1800
	21st to end	Day	29% 5% 8% 20% 29% 9%	1980
November	1st to 10th	Day	32% 5% 9% 17% 27% 11%	1857
	11th to 20th	Day	36% 5% 9% 16% 24% 10%	1900
	21st to end	Day	34% 5% 9% 20% 24% 8%	1810
December	1st to 10th	Day	43% 8% 12% 17% 14% 6%	1710
	11th to 20th	Day	32% 4 8% 23% 25% 8%	2150
	21st to end	Day	43% 5% 10% 17% 22% 3	3124
January	1st to 10th	Night	39% 5% 9% 19% 20% 6%	2459
	11th to 20th	Night	38% 7% 10% 17% 23% 6%	2393
	21st to end	Night	40% 4 7% 18% 24% 7%	2574
February	1st to 10th	Night	41% 4 10% 18% 20% 8%	2340
	11th to 20th	Night	42% 5% 9% 16% 19% 8%	2193
	21st to end	Night	43% 5% 10% 18% 14% 10%	1628
March	1st to 10th	Night	35% 5% 9% 20% 21% 10%	1980
	11th to 20th	Night	40% 9% 12% 16% 18% 5%	1980
	21st to end	Night	36% 7% 13% 22% 17% 5%	2178
April	1st to 10th	Night	34% 6% 12% 16% 23% 9%	1871
	11th to 20th	Night	34% 6% 12% 20% 18% 10%	1775
	21st to end	Night	27% 7% 15% 26% 21% 4	1800
May	1st to 10th	Night	30% 9% 15% 23% 20% 4	1762
	11th to 20th	Night	36% 9% 17% 23% 15% 1	1593
	21st to end	Night	32% 12% 17% 27% 12% 1	1745
June	1st to 10th	Night	41% 11% 17% 22% 9%	1620
	11th to 20th	Night	34% 11% 21% 25% 9% 1	1620
	21st to end	Night	36% 15% 21% 21% 6% 1	1620
July	1st to 10th	Night	38% 14% 21% 17% 9% 1	1575
	11th to 20th	Night	37% 14% 27% 16% 5%	1566
	21st to end	Night	34% 13% 23% 24% 6%	1672
August	1st to 10th	Night	35% 15% 24% 22% 4	1600
	11th to 20th	Night	40% 14% 20% 20% 5%	1709
	21st to end	Night	41% 13% 21% 19% 6% 1	1980
September	1st to 10th	Night	36% 12% 19% 17% 13% 3	1800
	11th to 20th	Night	41% 11% 14% 18% 15% 2	1909
	21st to end	Night	44% 6% 12% 20% 14% 4	2024
October	1st to 10th	Night	38% 5% 12% 19% 21% 5%	2160
	11th to 20th	Night	30% 6% 11% 21% 25% 7%	2160
	21st to end	Night	30% 4 9% 20% 26% 10%	2376
November	1st to 10th	Night	32% 5% 9% 17% 26% 12%	2221
	11th to 20th	Night	37% 4 9% 16% 23% 11%	2280
	21st to end	Night	33% 6% 11% 21% 22% 7%	2365
December	1st to 10th	Night	42% 8% 12% 15% 17% 6%	2470
	11th to 20th	Night	37% 4 8% 17% 26% 7%	3044
	21st to end	Night	41% 5% 8% 19% 23% 4	4532

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	18% 18% 43% 15% 5%	270
	11th to 20th	Day	14% 18% 37% 26% 4 1	252
	21st to end	Day	19% 23% 36% 17% 3 1	264
February	1st to 10th	Day	18% 19% 38% 23% 2	240
	11th to 20th	Day	27% 19% 35% 16% 3	305
	21st to end	Day	17% 19% 38% 20% 5% 1	346
March	1st to 10th	Day	15% 17% 35% 25% 8%	420
	11th to 20th	Day	19% 18% 36% 19% 7% 1	420
	21st to end	Day	15% 15% 37% 23% 8% 2	462
April	1st to 10th	Day	15% 18% 31% 24% 9% 3	420
	11th to 20th	Day	11% 17% 29% 21% 16% 7%	412
	21st to end	Day	10% 13% 29% 29% 14% 6%	420
May	1st to 10th	Day	8% 15% 36% 22% 14% 6%	423
	11th to 20th	Day	14% 4 24% 29% 20% 8%	447
	21st to end	Day	15% 4 14% 32% 22% 13%	485
June	1st to 10th	Day	10% 3 20% 34% 23% 10%	450
	11th to 20th	Day	11% 5% 17% 26% 25% 16%	450
	21st to end	Day	9% 4 15% 32% 28% 11%	450
July	1st to 10th	Day	9% 2 6% 31% 36% 15%	445
	11th to 20th	Day	9% 3 9% 30% 34% 16%	444
	21st to end	Day	6% 2 12% 34% 32% 13%	488
August	1st to 10th	Day	14% 3 11% 26% 29% 16%	446
	11th to 20th	Day	10% 2 7% 29% 29% 22%	439
	21st to end	Day	12% 4 9% 25% 31% 20%	495
September	1st to 10th	Day	8% 2 11% 31% 31% 17%	450
	11th to 20th	Day	16% 5% 16% 28% 24% 12%	450
	21st to end	Day	19% 3 15% 30% 23% 11%	450
October	1st to 10th	Day	15% 5% 22% 29% 17% 11%	450
	11th to 20th	Day	11% 7% 22% 33% 20% 7%	450
	21st to end	Day	11% 6% 28% 31% 20% 4	495
November	1st to 10th	Day	16% 7% 28% 27% 16% 5%	455
	11th to 20th	Day	15% 10% 36% 26% 12% 1	460
	21st to end	Day	13% 10% 31% 29% 13% 4	370
December	1st to 10th	Day	20% 10% 39% 20% 10% 1	270
	11th to 20th	Day	20% 14% 34% 21% 9% 1	270
	21st to end	Day	21% 12% 37% 18% 11% 2	297
January	1st to 10th	Night	17% 15% 32% 29% 8%	760
	11th to 20th	Night	15% 14% 28% 33% 9%	737
	21st to end	Night	17% 12% 37% 30% 4	792
February	1st to 10th	Night	19% 11% 34% 30% 6%	720
	11th to 20th	Night	21% 14% 36% 25% 3	703
	21st to end	Night	19% 15% 31% 30% 6%	592
March	1st to 10th	Night	14% 10% 39% 29% 8%	720
	11th to 20th	Night	16% 11% 35% 30% 7% 1	720
	21st to end	Night	14% 10% 36% 30% 10% 1	792
April	1st to 10th	Night	14% 12% 34% 29% 11% 1	720
	11th to 20th	Night	12% 12% 28% 29% 19% 1	711
	21st to end	Night	8% 8% 33% 36% 14% 1	720
May	1st to 10th	Night	9% 8% 32% 34% 16% 1	682
	11th to 20th	Night	12% 7% 18% 40% 20% 3	531
	21st to end	Night	10% 2 10% 36% 34% 8%	584
June	1st to 10th	Night	13% 3 12% 39% 29% 4	540
	11th to 20th	Night	10% 2 12% 34% 31% 10%	540
	21st to end	Night	8% 3 11% 41% 32% 5%	540
July	1st to 10th	Night	10% 3 6% 34% 42% 5%	525
	11th to 20th	Night	9% 1 4 33% 45% 7%	522
	21st to end	Night	7% 3 6% 39% 39% 6%	591
August	1st to 10th	Night	10% 2 6% 33% 39% 9%	537
	11th to 20th	Night	9% 2 7% 33% 40% 8%	645
	21st to end	Night	12% 1 7% 29% 39% 12%	792
September	1st to 10th	Night	10% 1 9% 31% 40% 8%	720
	11th to 20th	Night	14% 2 10% 37% 30% 8%	720
	21st to end	Night	19% 3 13% 32% 27% 6%	720
October	1st to 10th	Night	13% 6% 19% 32% 25% 6%	720
	11th to 20th	Night	10% 6% 22% 35% 23% 4	720
	21st to end	Night	12% 8% 21% 35% 21% 4	792
November	1st to 10th	Night	12% 6% 24% 37% 17% 4	740
	11th to 20th	Night	14% 12% 27% 31% 14% 2	760
	21st to end	Night	14% 8% 27% 32% 15% 3	760
December	1st to 10th	Night	20% 9% 28% 31% 10% 1	760
	11th to 20th	Night	18% 9% 28% 32% 12% 1	760
	21st to end	Night	18% 11% 30% 29% 10% 1	836

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