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 2024-11-30.

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% 6% 2 6% 4 4 5% 4 6% 8% 42%	101280
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 43%	98267
Transparency	Day	37% 8% 15% 20% 16% 5%	104926
	Night	37% 7% 13% 19% 17% 6%	102760
Seeing	Day	14% 9% 25% 27% 18% 8%	15804
	Night	14% 8% 23% 33% 20% 3	25909

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	15% 5% 1 5% 3 4 4 3 5% 8% 47%	2836
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 4 5% 7% 48%	2840
	21st to end	Day	14% 7% 3 7% 5% 5% 4 3 3 5% 44%	3124
February	1st to 10th	Day	15% 7% 2 7% 4 4 4 3 6% 5% 41%	1710
	11th to 20th	Day	18% 6% 2 5% 4 3 3 3 5% 5% 46%	1740
	21st to end	Day	15% 6% 2 6% 5% 3 4 5% 5% 7% 41%	1727
March	1st to 10th	Day	21% 9% 3 8% 3 3 3 3 5% 5% 37%	3435
	11th to 20th	Day	8% 4 1 5% 4 4 4 3 5% 7% 53%	3480
	21st to end	Day	15% 6% 3 6% 4 4 4 3 4 5% 45%	3815
April	1st to 10th	Day	9% 5% 2 4 3 3 5% 4 6% 7% 52%	2204
	11th to 20th	Day	9% 4 2 4 4 3 4 3 6% 7% 53%	2254
	21st to end	Day	7% 4 2 4 4 4 5% 4 5% 8% 54%	2280
May	1st to 10th	Day	6% 5% 2 6% 4 5% 5% 5% 7% 10% 43%	3860
	11th to 20th	Day	14% 7% 3 8% 5% 4 4 4 6% 8% 38%	4081
	21st to end	Day	7% 4 1 4 4 4 5% 5% 9% 10% 47%	4476
June	1st to 10th	Day	9% 7% 3 7% 5% 6% 6% 5% 8% 11% 35%	2470
	11th to 20th	Day	8% 5% 2 5% 4 5% 5% 6% 7% 12% 41%	2470
	21st to end	Day	7% 5% 2 7% 5% 5% 5% 6% 9% 13% 35%	2470
July	1st to 10th	Day	9% 6% 3 8% 6% 6% 6% 6% 9% 12% 31%	4120
	11th to 20th	Day	7% 5% 3 8% 6% 7% 8% 6% 9% 11% 29%	4120
	21st to end	Day	7% 6% 3 8% 7% 7% 8% 7% 9% 12% 27%	4466
August	1st to 10th	Day	21% 9% 4 8% 5% 4 5% 5% 8% 10% 22%	4104
	11th to 20th	Day	8% 6% 2 7% 5% 5% 6% 5% 8% 12% 35%	3802
	21st to end	Day	7% 6% 3 7% 5% 5% 5% 4 7% 11% 41%	4180
September	1st to 10th	Day	9% 5% 2 5% 6% 5% 5% 5% 7% 9% 41%	2280
	11th to 20th	Day	15% 6% 2 7% 4 4 6% 4 6% 9% 36%	2159
	21st to end	Day	14% 8% 4 7% 5% 4 4 4 5% 7% 39%	2041
October	1st to 10th	Day	13% 6% 2 7% 4 4 4 4 5% 6% 45%	1900
	11th to 20th	Day	9% 4 2 5% 3 3 3 3 5% 7% 57%	1900
	21st to end	Day	10% 5% 2 4 3 3 3 3 4 6% 58%	2090
November	1st to 10th	Day	12% 5% 2 4 4 3 3 3 5% 6% 54%	1957
	11th to 20th	Day	12% 6% 2 6% 4 3 4 3 4 5% 51%	2000
	21st to end	Day	11% 5% 2 6% 4 4 4 3 5% 6% 51%	1902
December	1st to 10th	Day	14% 7% 3 7% 5% 5% 4 4 7% 7% 38%	1710
	11th to 20th	Day	15% 5% 1 4 3 3 3 3 4 5% 55%	2153
	21st to end	Day	15% 8% 3 6% 5% 3 4 3 5% 6% 41%	3124
January	1st to 10th	Night	15% 7% 2 6% 3 4 4 3 5% 7% 45%	4109
	11th to 20th	Night	12% 7% 2 5% 4 5% 5% 5% 6% 8% 42%	4120
	21st to end	Night	13% 7% 3 8% 5% 4 4 3 5% 5% 44%	4532
February	1st to 10th	Night	16% 6% 2 5% 4 4 3 3 6% 6% 44%	2470
	11th to 20th	Night	17% 8% 3 6% 3 3 4 3 5% 5% 42%	2318
	21st to end	Night	15% 6% 3 6% 4 3 5% 3 5% 7% 42%	1727
March	1st to 10th	Night	21% 12% 4 7% 4 4 4 2 4 6% 32%	3418
	11th to 20th	Night	11% 5% 1 6% 4 4 4 3 6% 8% 47%	3480
	21st to end	Night	15% 4 2 5% 4 3 4 3 5% 7% 48%	3817
April	1st to 10th	Night	9% 6% 3 5% 4 5% 4 4 6% 8% 48%	1974
	11th to 20th	Night	10% 5% 2 6% 4 4 5% 3 5% 8% 49%	1875
	21st to end	Night	7% 5% 2 5% 4 3 4 4 6% 8% 54%	1900
May	1st to 10th	Night	6% 5% 2 6% 5% 4 5% 4 7% 10% 44%	3050
	11th to 20th	Night	12% 6% 3 8% 4 4 5% 4 6% 8% 41%	2812
	21st to end	Night	7% 4 1 6% 4 4 5% 5% 7% 9% 49%	3079
June	1st to 10th	Night	9% 7% 3 7% 5% 5% 4 5% 9% 10% 35%	1710
	11th to 20th	Night	8% 5% 2 5% 5% 5% 4 5% 8% 10% 42%	1710
	21st to end	Night	6% 6% 2 6% 5% 6% 7% 6% 8% 13% 34%	1710
July	1st to 10th	Night	8% 7% 3 7% 6% 6% 7% 5% 9% 12% 31%	2840
	11th to 20th	Night	8% 7% 3 8% 6% 5% 6% 7% 8% 12% 30%	2840
	21st to end	Night	8% 6% 2 8% 6% 7% 7% 6% 10% 13% 28%	3087
August	1st to 10th	Night	19% 9% 3 7% 4 4 5% 4 8% 11% 25%	2825
	11th to 20th	Night	5% 5% 2 7% 6% 5% 7% 5% 8% 12% 37%	2993
	21st to end	Night	6% 4 2 6% 4 4 5% 5% 8% 10% 46%	3476
September	1st to 10th	Night	9% 5% 2 6% 4 5% 5% 5% 8% 10% 40%	1900
	11th to 20th	Night	13% 6% 3 6% 5% 5% 5% 5% 6% 8% 38%	2016
	21st to end	Night	14% 8% 3 8% 4 4 3 4 5% 6% 40%	2137
October	1st to 10th	Night	11% 7% 2 6% 4 4 4 3 5% 6% 48%	2280
	11th to 20th	Night	9% 4 2 5% 3 4 3 3 5% 7% 56%	2280
	21st to end	Night	9% 5% 2 5% 4 3 4 3 5% 6% 55%	2508
November	1st to 10th	Night	11% 5% 2 5% 4 3 3 3 4 6% 54%	2341
	11th to 20th	Night	11% 7% 2 6% 5% 4 3 3 4 6% 49%	2400
	21st to end	Night	10% 6% 2 5% 3 4 4 4 6% 8% 49%	2489
December	1st to 10th	Night	16% 6% 2 7% 4 4 4 4 5% 6% 41%	2470
	11th to 20th	Night	16% 6% 2 6% 3 3 3 3 4 5% 50%	3042
	21st to end	Night	16% 7% 2 6% 4 4 3 3 5% 6% 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	34% 4 10% 19% 26% 7%	2837
	11th to 20th	Day	35% 4 7% 19% 26% 9%	2840
	21st to end	Day	41% 6% 7% 18% 19% 8%	3124
February	1st to 10th	Day	43% 6% 9% 19% 20% 4	1710
	11th to 20th	Day	41% 5% 7% 18% 21% 8%	1749
	21st to end	Day	40% 7% 11% 17% 16% 9%	1727
March	1st to 10th	Day	49% 6% 9% 15% 14% 7%	3435
	11th to 20th	Day	29% 7% 10% 17% 27% 10%	3480
	21st to end	Day	40% 6% 9% 21% 18% 6%	3815
April	1st to 10th	Day	30% 6% 14% 19% 24% 6%	2204
	11th to 20th	Day	29% 5% 13% 23% 19% 10%	2254
	21st to end	Day	26% 8% 15% 25% 22% 4	2280
May	1st to 10th	Day	31% 11% 20% 25% 11% 2	3895
	11th to 20th	Day	41% 9% 15% 21% 14%	4085
	21st to end	Day	25% 12% 21% 25% 15% 1	4489
June	1st to 10th	Day	40% 10% 17% 23% 9%	2470
	11th to 20th	Day	30% 13% 20% 24% 11% 1	2470
	21st to end	Day	35% 14% 21% 22% 7% 1	2470
July	1st to 10th	Day	43% 10% 23% 20% 4 1	4055
	11th to 20th	Day	43% 14% 28% 11% 3	4051
	21st to end	Day	43% 13% 23% 14% 6%	4324
August	1st to 10th	Day	53% 11% 22% 12% 2	4091
	11th to 20th	Day	38% 9% 21% 22% 9%	3840
	21st to end	Day	35% 8% 18% 34% 4 1	4180
September	1st to 10th	Day	35% 13% 18% 17% 13% 3	2280
	11th to 20th	Day	42% 10% 14% 15% 14% 4	2159
	21st to end	Day	42% 7% 14% 19% 15% 3	2041
October	1st to 10th	Day	40% 4 8% 20% 24% 4	3160
	11th to 20th	Day	19% 4 5% 17% 30% 25%	3140
	21st to end	Day	27% 3 6% 23% 31% 10%	3428
November	1st to 10th	Day	32% 4 10% 18% 26% 10%	1957
	11th to 20th	Day	37% 5% 8% 17% 24% 9%	2000
	21st to end	Day	34% 5% 9% 20% 25% 8%	1902
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	38% 4 9% 19% 21% 8%	4109
	11th to 20th	Night	39% 6% 9% 16% 25% 5%	4120
	21st to end	Night	40% 6% 7% 13% 25% 8%	4532
February	1st to 10th	Night	41% 4 10% 19% 20% 7%	2470
	11th to 20th	Night	43% 5% 9% 16% 19% 8%	2320
	21st to end	Night	42% 6% 9% 17% 16% 10%	1727
March	1st to 10th	Night	54% 6% 9% 13% 12% 6%	3418
	11th to 20th	Night	34% 6% 9% 14% 21% 15%	3480
	21st to end	Night	37% 6% 10% 24% 18% 6%	3817
April	1st to 10th	Night	34% 6% 12% 16% 22% 9%	1974
	11th to 20th	Night	33% 6% 12% 20% 19% 10%	1875
	21st to end	Night	27% 7% 15% 26% 20% 4	1900
May	1st to 10th	Night	31% 11% 18% 24% 13% 2	3080
	11th to 20th	Night	39% 9% 15% 22% 15%	2813
	21st to end	Night	27% 11% 18% 26% 17% 1	3087
June	1st to 10th	Night	40% 11% 18% 22% 9% 1	1710
	11th to 20th	Night	33% 11% 20% 26% 9% 1	1710
	21st to end	Night	36% 15% 21% 22% 6% 1	1710
July	1st to 10th	Night	44% 10% 20% 20% 5%	2795
	11th to 20th	Night	44% 12% 32% 9% 3	2786
	21st to end	Night	43% 15% 19% 19% 5%	2988
August	1st to 10th	Night	50% 11% 23% 14% 2	2814
	11th to 20th	Night	36% 9% 23% 25% 6%	3021
	21st to end	Night	32% 8% 18% 35% 7%	3476
September	1st to 10th	Night	38% 12% 19% 16% 12% 3	1900
	11th to 20th	Night	43% 10% 13% 17% 14% 2	2016
	21st to end	Night	44% 6% 12% 21% 13% 3	2137
October	1st to 10th	Night	38% 4 9% 19% 24% 5%	3800
	11th to 20th	Night	19% 3 6% 14% 24% 33%	3779
	21st to end	Night	26% 3 6% 26% 28% 12%	4120
November	1st to 10th	Night	33% 5% 9% 18% 25% 11%	2341
	11th to 20th	Night	37% 4 9% 16% 24% 10%	2400
	21st to end	Night	33% 5% 10% 21% 23% 7%	2489
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% 19% 37% 24% 4 1	270
	21st to end	Day	20% 22% 37% 18% 3 1	297
February	1st to 10th	Day	17% 17% 40% 24% 2	270
	11th to 20th	Day	27% 19% 35% 16% 3	338
	21st to end	Day	18% 20% 38% 19% 5% 1	382
March	1st to 10th	Day	15% 17% 34% 25% 8%	460
	11th to 20th	Day	17% 20% 37% 18% 6% 1	460
	21st to end	Day	15% 16% 39% 21% 8% 2	506
April	1st to 10th	Day	15% 20% 31% 23% 8% 3	460
	11th to 20th	Day	11% 17% 29% 22% 15% 6%	452
	21st to end	Day	10% 13% 28% 29% 13% 6%	460
May	1st to 10th	Day	8% 15% 34% 23% 14% 6%	463
	11th to 20th	Day	15% 5% 25% 29% 19% 7%	487
	21st to end	Day	14% 5% 15% 32% 21% 12%	529
June	1st to 10th	Day	10% 3 20% 35% 22% 10%	490
	11th to 20th	Day	11% 5% 19% 27% 24% 15%	490
	21st to end	Day	9% 4 17% 33% 27% 11%	490
July	1st to 10th	Day	10% 2 6% 31% 35% 15%	485
	11th to 20th	Day	9% 3 9% 30% 33% 15%	484
	21st to end	Day	6% 3 13% 35% 31% 12%	532
August	1st to 10th	Day	17% 4 11% 26% 28% 15%	486
	11th to 20th	Day	10% 3 10% 29% 27% 21%	479
	21st to end	Day	11% 4 10% 26% 30% 19%	539
September	1st to 10th	Day	9% 3 12% 31% 29% 16%	490
	11th to 20th	Day	19% 5% 16% 27% 22% 11%	490
	21st to end	Day	18% 4 16% 31% 21% 10%	490
October	1st to 10th	Day	16% 5% 21% 29% 17% 11%	490
	11th to 20th	Day	10% 8% 23% 33% 19% 6%	490
	21st to end	Day	11% 6% 27% 32% 20% 4	539
November	1st to 10th	Day	15% 7% 28% 28% 16% 4	495
	11th to 20th	Day	14% 11% 36% 26% 12% 1	500
	21st to end	Day	13% 12% 31% 27% 13% 3	404
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	16% 14% 29% 32% 9%	760
	21st to end	Night	17% 12% 36% 29% 4	836
February	1st to 10th	Night	18% 11% 34% 31% 6%	760
	11th to 20th	Night	21% 14% 37% 25% 3	743
	21st to end	Night	19% 15% 30% 30% 6%	628
March	1st to 10th	Night	16% 10% 38% 29% 7%	760
	11th to 20th	Night	16% 12% 35% 30% 7% 1	760
	21st to end	Night	14% 10% 37% 29% 9%	836
April	1st to 10th	Night	13% 13% 34% 29% 10% 1	760
	11th to 20th	Night	12% 12% 28% 29% 18% 1	751
	21st to end	Night	9% 8% 33% 36% 14% 1	760
May	1st to 10th	Night	8% 9% 32% 35% 16% 1	719
	11th to 20th	Night	12% 7% 19% 40% 19% 3	561
	21st to end	Night	9% 2 12% 36% 33% 8%	617
June	1st to 10th	Night	12% 3 12% 40% 29% 4	570
	11th to 20th	Night	10% 2 12% 35% 30% 10%	570
	21st to end	Night	9% 3 11% 40% 32% 5%	570
July	1st to 10th	Night	9% 3 6% 34% 43% 5%	555
	11th to 20th	Night	10% 1 4 34% 44% 7%	552
	21st to end	Night	8% 3 7% 39% 38% 6%	624
August	1st to 10th	Night	12% 3 6% 33% 37% 9%	567
	11th to 20th	Night	9% 2 8% 34% 39% 8%	682
	21st to end	Night	12% 2 8% 29% 38% 12%	836
September	1st to 10th	Night	11% 1 10% 32% 39% 7%	760
	11th to 20th	Night	15% 3 10% 35% 29% 7%	760
	21st to end	Night	18% 3 12% 33% 27% 6%	760
October	1st to 10th	Night	13% 6% 19% 33% 25% 6%	760
	11th to 20th	Night	10% 6% 23% 36% 22% 4	760
	21st to end	Night	11% 8% 20% 36% 22% 4	836
November	1st to 10th	Night	12% 6% 24% 38% 17% 3	780
	11th to 20th	Night	14% 13% 28% 30% 14% 2	800
	21st to end	Night	14% 8% 28% 32% 15% 3	800
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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