Fruitland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fruitland clear sky chart from 2005-11-06 to 2026-06-01.

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	12% 7% 2 6% 4 4 4 4 5% 8% 43%	131977
	Night	13% 7% 2 6% 4 4 4 3 5% 7% 45%	131381
Transparency	Day	38% 5% 11% 25% 17% 3	135572
	Night	38% 5% 11% 24% 19% 4	135840
Seeing	Day	15% 9% 24% 26% 18% 8%	17593
	Night	16% 8% 26% 31% 16% 2	27458

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% 9% 4 8% 5% 4 3 4 5% 6% 39%	4691
	11th to 20th	Day	9% 5% 3 6% 5% 4 4 3 5% 6% 49%	5088
	21st to end	Day	17% 9% 3 7% 4 4 4 2 4 5% 41%	5812
February	1st to 10th	Day	16% 12% 2 7% 3 5% 4 3 4 6% 38%	1973
	11th to 20th	Day	17% 10% 3 7% 4 4 4 3 4 6% 38%	2048
	21st to end	Day	15% 11% 3 6% 4 5% 4 4 5% 6% 38%	1730
March	1st to 10th	Day	17% 11% 3 7% 4 4 3 3 4 4 41%	4580
	11th to 20th	Day	10% 7% 2 5% 3 3 3 3 5% 6% 53%	5032
	21st to end	Day	14% 7% 3 7% 4 3 4 3 6% 7% 42%	5976
April	1st to 10th	Day	13% 6% 2 5% 3 4 4 4 6% 7% 44%	2520
	11th to 20th	Day	16% 7% 3 7% 4 4 4 3 4 7% 41%	2494
	21st to end	Day	16% 8% 3 7% 4 5% 4 4 5% 7% 39%	2520
May	1st to 10th	Day	15% 7% 3 8% 6% 6% 6% 5% 6% 9% 30%	5702
	11th to 20th	Day	16% 9% 3 7% 4 5% 5% 4 6% 8% 33%	6074
	21st to end	Day	14% 7% 3 6% 4 5% 5% 4 5% 7% 39%	7089
June	1st to 10th	Day	10% 5% 2 5% 4 4 5% 4 6% 9% 46%	2801
	11th to 20th	Day	6% 4 2 5% 5% 5% 5% 4 6% 9% 49%	2800
	21st to end	Day	5% 4 2 5% 4 5% 5% 5% 7% 11% 48%	2800
July	1st to 10th	Day	9% 5% 2 6% 5% 5% 5% 4 6% 9% 46%	6360
	11th to 20th	Day	5% 4 2 6% 4 5% 6% 5% 8% 12% 44%	6360
	21st to end	Day	6% 5% 2 7% 5% 5% 6% 5% 8% 11% 39%	6591
August	1st to 10th	Day	4 3 1 5% 4 4 5% 4 7% 10% 54%	4046
	11th to 20th	Day	11% 6% 2 5% 4 4 4 4 6% 9% 45%	3849
	21st to end	Day	5% 4 1 4 3 4 4 4 5% 9% 56%	4312
September	1st to 10th	Day	10% 5% 2 6% 5% 4 4 3 5% 7% 48%	2400
	11th to 20th	Day	9% 6% 2 6% 4 4 5% 4 5% 7% 49%	2330
	21st to end	Day	11% 5% 2 5% 3 3 4 3 5% 8% 52%	2200
October	1st to 10th	Day	8% 4 2 3 3 3 3 3 4 7% 60%	2076
	11th to 20th	Day	13% 5% 1 5% 4 3 3 2 5% 5% 54%	2000
	21st to end	Day	19% 6% 2 5% 4 3 3 2 4 5% 47%	2157
November	1st to 10th	Day	11% 6% 2 5% 4 3 3 3 4 6% 52%	1852
	11th to 20th	Day	13% 8% 2 5% 4 3 4 3 4 6% 47%	1890
	21st to end	Day	19% 10% 2 5% 3 2 3 3 4 5% 43%	1890
December	1st to 10th	Day	10% 9% 2 6% 3 3 3 3 4 6% 50%	2776
	11th to 20th	Day	15% 9% 3 7% 4 4 4 3 5% 5% 42%	3088
	21st to end	Day	24% 15% 4 8% 4 4 3 3 3 5% 27%	4070
January	1st to 10th	Night	16% 10% 3 8% 4 4 4 3 4 5% 39%	8232
	11th to 20th	Night	11% 7% 3 8% 4 4 4 3 5% 5% 45%	7883
	21st to end	Night	18% 8% 3 6% 4 4 4 3 5% 5% 40%	8402
February	1st to 10th	Night	18% 11% 4 7% 4 4 4 3 4 5% 37%	2646
	11th to 20th	Night	17% 8% 3 7% 4 4 3 3 3 6% 42%	2458
	21st to end	Night	18% 8% 3 5% 4 4 3 3 4 6% 41%	2076
March	1st to 10th	Night	17% 9% 3 8% 5% 4 4 3 5% 4 38%	5493
	11th to 20th	Night	12% 7% 2 6% 3 3 4 3 5% 6% 49%	5189
	21st to end	Night	14% 6% 2 7% 5% 5% 5% 3 5% 7% 41%	5181
April	1st to 10th	Night	12% 6% 2 4 3 4 4 3 6% 7% 48%	2100
	11th to 20th	Night	15% 6% 2 5% 4 4 5% 4 6% 6% 44%	2075
	21st to end	Night	18% 7% 2 6% 4 4 4 3 5% 7% 40%	2100
May	1st to 10th	Night	16% 8% 3 7% 5% 4 5% 4 6% 8% 34%	4410
	11th to 20th	Night	14% 8% 3 9% 4 5% 4 3 5% 8% 37%	4038
	21st to end	Night	15% 7% 2 7% 5% 4 4 3 6% 7% 37%	4030
June	1st to 10th	Night	9% 5% 2 5% 5% 5% 5% 4 6% 9% 45%	1600
	11th to 20th	Night	5% 3 2 5% 4 4 4 4 6% 9% 55%	1600
	21st to end	Night	3 3 1 3 3 4 5% 5% 8% 10% 54%	1600
July	1st to 10th	Night	9% 4 2 5% 4 4 5% 4 5% 8% 50%	3618
	11th to 20th	Night	5% 4 2 5% 5% 5% 5% 5% 7% 9% 48%	3617
	21st to end	Night	5% 6% 2 5% 4 3 4 5% 7% 11% 46%	4262
August	1st to 10th	Night	4 3 1 4 3 3 4 4 5% 9% 61%	3104
	11th to 20th	Night	7% 5% 2 5% 4 4 4 4 6% 9% 51%	3200
	21st to end	Night	3 3 2 4 3 3 3 4 6% 9% 60%	3586
September	1st to 10th	Night	9% 6% 2 5% 3 4 4 3 6% 6% 53%	2000
	11th to 20th	Night	8% 4 2 6% 4 3 4 3 5% 8% 53%	2050
	21st to end	Night	11% 5% 2 5% 3 3 4 3 4 7% 54%	2200
October	1st to 10th	Night	6% 4 1 4 3 4 3 2 4 6% 63%	2320
	11th to 20th	Night	12% 5% 2 5% 3 2 4 2 4 5% 57%	2400
	21st to end	Night	18% 7% 2 5% 3 3 3 2 3 5% 48%	2680
November	1st to 10th	Night	11% 5% 2 5% 3 2 2 2 5% 6% 56%	2666
	11th to 20th	Night	12% 6% 2 5% 4 3 3 3 4 6% 52%	2730
	21st to end	Night	19% 8% 2 6% 3 3 3 2 3 5% 47%	2730
December	1st to 10th	Night	15% 8% 2 6% 4 4 3 3 4 6% 46%	4616
	11th to 20th	Night	16% 8% 2 5% 4 4 4 3 4 6% 45%	5339
	21st to end	Night	24% 12% 3 7% 4 4 4 3 4 5% 31%	7150

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	45% 4 13% 26% 10% 2	4692
	11th to 20th	Day	34% 4 8% 30% 20% 4	5088
	21st to end	Day	46% 3 10% 20% 12% 8%	5812
February	1st to 10th	Day	48% 3 13% 21% 13% 1	1973
	11th to 20th	Day	48% 3 10% 19% 14% 5%	2058
	21st to end	Day	47% 4 9% 22% 13% 5%	1730
March	1st to 10th	Day	47% 4 5% 21% 17% 6%	4580
	11th to 20th	Day	33% 4 9% 29% 20% 6%	5032
	21st to end	Day	41% 4 13% 29% 12%	5978
April	1st to 10th	Day	37% 5% 11% 26% 18% 1	2520
	11th to 20th	Day	44% 4 12% 21% 16% 4	2494
	21st to end	Day	44% 5% 11% 25% 14% 1	2520
May	1st to 10th	Day	48% 8% 12% 20% 11% 1	5737
	11th to 20th	Day	47% 7% 12% 22% 12% 1	6078
	21st to end	Day	43% 6% 10% 21% 18% 3	7103
June	1st to 10th	Day	33% 7% 14% 25% 19% 2	2801
	11th to 20th	Day	30% 6% 12% 29% 22% 3	2800
	21st to end	Day	27% 8% 17% 26% 17% 5%	2800
July	1st to 10th	Day	33% 7% 12% 26% 20% 2	6291
	11th to 20th	Day	29% 10% 18% 31% 12% 2	6285
	21st to end	Day	35% 9% 18% 29% 9% 1	6405
August	1st to 10th	Day	23% 8% 15% 31% 22% 1	4032
	11th to 20th	Day	34% 6% 13% 27% 18% 2	3885
	21st to end	Day	24% 5% 13% 36% 18% 3	4311
September	1st to 10th	Day	34% 5% 10% 26% 20% 4	2400
	11th to 20th	Day	33% 6% 10% 23% 26% 2	2330
	21st to end	Day	32% 5% 8% 25% 27% 3	2200
October	1st to 10th	Day	15% 3 6% 21% 45% 11%	3375
	11th to 20th	Day	22% 3 6% 22% 36% 10%	3240
	21st to end	Day	31% 3 5% 28% 27% 5%	3459
November	1st to 10th	Day	33% 5% 9% 27% 20% 6%	1852
	11th to 20th	Day	38% 4 7% 23% 22% 6%	1890
	21st to end	Day	44% 4 7% 24% 19% 2	1890
December	1st to 10th	Day	36% 4 8% 35% 16% 1	2776
	11th to 20th	Day	44% 4 9% 26% 15% 2	3085
	21st to end	Day	61% 3 11% 15% 8% 1	4070
January	1st to 10th	Night	47% 4 12% 26% 11% 1	8233
	11th to 20th	Night	38% 5% 6% 25% 21% 3	7883
	21st to end	Night	45% 4 10% 22% 15% 3	8402
February	1st to 10th	Night	50% 4 10% 23% 13% 2	2646
	11th to 20th	Night	45% 3 9% 23% 17% 3	2459
	21st to end	Night	44% 4 9% 22% 17% 4	2076
March	1st to 10th	Night	49% 4 7% 18% 17% 6%	5493
	11th to 20th	Night	36% 5% 9% 22% 19% 9%	5189
	21st to end	Night	42% 5% 11% 28% 12% 1	5181
April	1st to 10th	Night	34% 5% 12% 27% 19% 4	2100
	11th to 20th	Night	38% 5% 10% 23% 19% 4	2075
	21st to end	Night	44% 5% 9% 25% 15% 3	2100
May	1st to 10th	Night	46% 7% 16% 21% 9% 1	4440
	11th to 20th	Night	45% 6% 13% 20% 14% 2	4039
	21st to end	Night	43% 7% 10% 22% 14% 3	4038
June	1st to 10th	Night	32% 7% 13% 25% 19% 3	1600
	11th to 20th	Night	25% 6% 12% 27% 24% 6%	1600
	21st to end	Night	21% 7% 17% 29% 18% 8%	1600
July	1st to 10th	Night	31% 7% 11% 24% 23% 3	3580
	11th to 20th	Night	30% 8% 16% 30% 13% 3	3572
	21st to end	Night	28% 8% 23% 27% 14% 1	4138
August	1st to 10th	Night	19% 7% 19% 34% 21% 1	3094
	11th to 20th	Night	30% 5% 16% 27% 18% 4	3230
	21st to end	Night	21% 5% 11% 37% 23% 3	3586
September	1st to 10th	Night	31% 6% 7% 29% 21% 6%	2000
	11th to 20th	Night	30% 6% 9% 27% 25% 4	2050
	21st to end	Night	31% 5% 9% 20% 28% 6%	2200
October	1st to 10th	Night	15% 2 6% 17% 43% 17%	3788
	11th to 20th	Night	22% 3 5% 19% 42% 10%	3899
	21st to end	Night	30% 3 6% 25% 28% 8%	4316
November	1st to 10th	Night	30% 3 10% 28% 24% 6%	2666
	11th to 20th	Night	34% 3 8% 26% 23% 7%	2730
	21st to end	Night	42% 3 8% 25% 21% 2	2730
December	1st to 10th	Night	40% 4 10% 28% 18% 1	4616
	11th to 20th	Night	42% 4 12% 22% 20% 1	5341
	21st to end	Night	55% 5% 10% 19% 9% 1	7150

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% 14% 32% 22% 6%	330
	11th to 20th	Day	22% 20% 40% 16% 2 1	330
	21st to end	Day	20% 17% 40% 19% 3	363
February	1st to 10th	Day	24% 15% 41% 15% 5%	330
	11th to 20th	Day	25% 24% 32% 15% 3	330
	21st to end	Day	26% 19% 35% 16% 4	273
March	1st to 10th	Day	21% 17% 35% 18% 8%	330
	11th to 20th	Day	25% 19% 37% 15% 3 1	330
	21st to end	Day	24% 16% 34% 21% 6%	536
April	1st to 10th	Day	16% 15% 35% 24% 9% 1	540
	11th to 20th	Day	21% 18% 28% 20% 11% 1	532
	21st to end	Day	18% 14% 30% 27% 9% 2	540
May	1st to 10th	Day	15% 14% 32% 25% 11% 2	543
	11th to 20th	Day	18% 8% 27% 25% 16% 7%	598
	21st to end	Day	13% 7% 22% 32% 18% 7%	844
June	1st to 10th	Day	12% 5% 19% 24% 27% 14%	731
	11th to 20th	Day	7% 2 16% 37% 26% 11%	730
	21st to end	Day	6% 3 21% 38% 22% 10%	730
July	1st to 10th	Day	10% 3 11% 27% 26% 22%	721
	11th to 20th	Day	6% 3 13% 34% 31% 14%	718
	21st to end	Day	7% 3 12% 31% 33% 14%	794
August	1st to 10th	Day	9% 2 10% 31% 33% 15%	616
	11th to 20th	Day	13% 3 14% 25% 31% 14%	519
	21st to end	Day	8% 2 9% 27% 36% 18%	583
September	1st to 10th	Day	9% 4 13% 29% 31% 14%	530
	11th to 20th	Day	8% 3 8% 27% 37% 17%	530
	21st to end	Day	13% 8% 17% 27% 24% 11%	530
October	1st to 10th	Day	8% 4 18% 39% 21% 10%	406
	11th to 20th	Day	15% 11% 31% 26% 14% 4	330
	21st to end	Day	25% 15% 30% 23% 7% 1	363
November	1st to 10th	Day	14% 14% 29% 27% 12% 4	330
	11th to 20th	Day	13% 18% 32% 23% 13% 2	330
	21st to end	Day	25% 15% 28% 23% 9% 1	330
December	1st to 10th	Day	17% 16% 33% 23% 9% 3	330
	11th to 20th	Day	23% 16% 32% 21% 8%	330
	21st to end	Day	26% 15% 38% 16% 5%	363
January	1st to 10th	Night	22% 13% 34% 27% 4	1050
	11th to 20th	Night	22% 16% 38% 20% 3	1050
	21st to end	Night	20% 12% 40% 27% 2	1155
February	1st to 10th	Night	23% 15% 35% 25% 2	966
	11th to 20th	Night	23% 16% 34% 24% 3	823
	21st to end	Night	23% 14% 38% 23% 2	692
March	1st to 10th	Night	23% 14% 33% 26% 4	840
	11th to 20th	Night	21% 11% 34% 28% 5%	677
	21st to end	Night	22% 11% 30% 30% 7%	693
April	1st to 10th	Night	14% 11% 38% 30% 6%	630
	11th to 20th	Night	18% 11% 30% 29% 11% 1	623
	21st to end	Night	21% 7% 32% 30% 10% 1	630
May	1st to 10th	Night	16% 6% 29% 37% 11% 1	630
	11th to 20th	Night	16% 6% 23% 37% 17% 1	621
	21st to end	Night	10% 5% 18% 42% 22% 4	683
June	1st to 10th	Night	12% 3 13% 38% 31% 3	600
	11th to 20th	Night	5% 3 11% 50% 29% 2	600
	21st to end	Night	5% 2 14% 43% 34% 2	600
July	1st to 10th	Night	9% 2 7% 34% 39% 9%	585
	11th to 20th	Night	5% 3 9% 37% 39% 7%	582
	21st to end	Night	7% 2 9% 34% 42% 5%	657
August	1st to 10th	Night	6% 2 8% 40% 39% 6%	597
	11th to 20th	Night	8% 2 8% 37% 40% 5%	594
	21st to end	Night	6% 2 7% 33% 45% 7%	660
September	1st to 10th	Night	12% 2 10% 35% 36% 6%	600
	11th to 20th	Night	9% 3 10% 34% 37% 7%	650
	21st to end	Night	13% 4 17% 34% 29% 4	800
October	1st to 10th	Night	8% 4 20% 38% 26% 4	800
	11th to 20th	Night	13% 7% 28% 32% 19% 2	800
	21st to end	Night	22% 8% 28% 31% 10%	880
November	1st to 10th	Night	14% 7% 30% 36% 13%	820
	11th to 20th	Night	16% 9% 33% 31% 10%	840
	21st to end	Night	23% 10% 29% 29% 9%	840
December	1st to 10th	Night	22% 12% 32% 28% 5%	985
	11th to 20th	Night	22% 10% 31% 30% 6%	1050
	21st to end	Night	25% 11% 34% 25% 4	1155

Page generated at 2026-05-29 00:53:28. Version ac07

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