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 2024-08-30.

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	13% 7% 2 6% 4 4 4 4 5% 7% 43%	95633
	Night	14% 7% 2 6% 4 4 4 3 5% 7% 45%	93443
Transparency	Day	39% 6% 11% 25% 16% 3	95391
	Night	39% 5% 11% 25% 17% 3	93293
Seeing	Day	14% 8% 23% 27% 20% 8%	15284
	Night	16% 8% 26% 32% 17% 2	25059

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% 11% 4 7% 5% 3 3 3 5% 6% 40%	2527
	11th to 20th	Day	16% 8% 3 5% 4 3 3 3 5% 6% 43%	2726
	21st to end	Day	24% 12% 3 6% 3 3 4 2 4 5% 34%	3135
February	1st to 10th	Day	16% 12% 2 7% 3 5% 4 3 4 6% 38%	1785
	11th to 20th	Day	16% 10% 3 7% 4 4 4 3 4 6% 39%	1848
	21st to end	Day	16% 11% 3 6% 4 4 4 4 5% 7% 36%	1570
March	1st to 10th	Day	20% 11% 3 7% 4 4 4 3 4 4 37%	3120
	11th to 20th	Day	13% 7% 3 5% 3 3 3 3 4 5% 50%	3438
	21st to end	Day	15% 7% 3 6% 4 3 4 3 6% 6% 41%	4087
April	1st to 10th	Day	12% 6% 2 5% 4 4 4 4 6% 7% 45%	2280
	11th to 20th	Day	16% 7% 3 7% 4 4 4 3 4 7% 42%	2254
	21st to end	Day	17% 8% 3 7% 4 5% 4 3 5% 6% 39%	2280
May	1st to 10th	Day	14% 6% 3 7% 6% 6% 5% 4 7% 9% 34%	3883
	11th to 20th	Day	17% 7% 3 6% 4 4 4 4 6% 8% 38%	4135
	21st to end	Day	11% 7% 3 6% 5% 5% 5% 4 5% 8% 41%	4824
June	1st to 10th	Day	9% 5% 2 5% 4 4 5% 5% 6% 9% 46%	2660
	11th to 20th	Day	5% 4 2 5% 5% 5% 5% 4 6% 9% 50%	2660
	21st to end	Day	5% 4 2 4 4 5% 5% 5% 7% 11% 48%	2660
July	1st to 10th	Day	10% 4 2 6% 4 5% 6% 4 7% 10% 42%	4440
	11th to 20th	Day	4 3 2 5% 4 4 5% 5% 7% 11% 51%	4440
	21st to end	Day	8% 7% 3 8% 6% 6% 7% 5% 7% 9% 35%	4578
August	1st to 10th	Day	7% 5% 2 6% 5% 5% 6% 5% 7% 10% 44%	2354
	11th to 20th	Day	9% 6% 2 6% 5% 5% 5% 4 7% 10% 41%	2245
	21st to end	Day	7% 5% 2 5% 4 4 5% 5% 6% 9% 49%	2485
September	1st to 10th	Day	10% 6% 2 6% 5% 4 4 3 6% 8% 47%	2160
	11th to 20th	Day	8% 5% 2 6% 4 4 5% 4 5% 7% 49%	2098
	21st to end	Day	10% 5% 2 4 3 2 4 3 5% 8% 54%	1980
October	1st to 10th	Day	8% 4 2 4 3 3 3 3 5% 7% 57%	1869
	11th to 20th	Day	14% 5% 2 5% 4 3 3 2 5% 5% 51%	1800
	21st to end	Day	19% 6% 2 5% 4 3 3 2 4 6% 46%	1942
November	1st to 10th	Day	10% 6% 2 5% 4 3 3 3 4 6% 54%	1672
	11th to 20th	Day	13% 8% 2 5% 4 3 4 3 4 6% 47%	1710
	21st to end	Day	18% 9% 2 5% 3 3 4 3 5% 5% 42%	1710
December	1st to 10th	Day	15% 9% 2 6% 4 3 4 4 4 8% 41%	1577
	11th to 20th	Day	16% 9% 3 7% 5% 5% 4 4 5% 5% 38%	1918
	21st to end	Day	20% 15% 3 7% 4 4 4 3 4 5% 30%	2783
January	1st to 10th	Night	17% 8% 3 6% 4 4 4 3 5% 6% 41%	4428
	11th to 20th	Night	15% 8% 4 9% 5% 5% 5% 3 5% 6% 36%	4239
	21st to end	Night	24% 9% 3 6% 4 4 3 3 5% 5% 35%	4532
February	1st to 10th	Night	19% 11% 4 7% 4 4 3 3 4 5% 36%	2394
	11th to 20th	Night	16% 8% 3 7% 4 4 3 3 3 6% 43%	2218
	21st to end	Night	19% 8% 3 6% 5% 4 3 3 4 6% 39%	1884
March	1st to 10th	Night	21% 10% 3 6% 4 3 3 3 5% 4 38%	3733
	11th to 20th	Night	13% 6% 2 6% 3 3 4 3 5% 6% 49%	3549
	21st to end	Night	14% 6% 2 7% 5% 4 5% 3 5% 7% 41%	3544
April	1st to 10th	Night	11% 6% 2 4 3 4 5% 3 5% 7% 49%	1900
	11th to 20th	Night	15% 5% 2 5% 4 4 5% 4 6% 6% 44%	1875
	21st to end	Night	19% 7% 2 5% 4 4 4 3 5% 6% 40%	1900
May	1st to 10th	Night	18% 7% 2 5% 4 3 4 4 5% 9% 40%	3010
	11th to 20th	Night	15% 7% 2 8% 4 4 3 3 5% 7% 43%	2756
	21st to end	Night	9% 6% 2 7% 6% 5% 5% 4 8% 9% 40%	2743
June	1st to 10th	Night	9% 5% 2 5% 5% 5% 5% 4 6% 9% 46%	1520
	11th to 20th	Night	4 3 2 4 4 4 4 4 6% 9% 57%	1520
	21st to end	Night	3 3 1 3 3 4 5% 5% 8% 11% 53%	1520
July	1st to 10th	Night	10% 4 2 5% 4 4 4 4 5% 9% 49%	2530
	11th to 20th	Night	5% 3 2 4 4 4 4 3 5% 8% 57%	2530
	21st to end	Night	6% 9% 3 7% 5% 4 5% 5% 7% 9% 40%	2967
August	1st to 10th	Night	6% 4 1 4 4 4 4 5% 6% 10% 52%	1801
	11th to 20th	Night	7% 4 2 5% 4 5% 4 4 5% 9% 52%	1876
	21st to end	Night	5% 4 2 5% 4 4 4 4 6% 9% 53%	2080
September	1st to 10th	Night	9% 6% 2 5% 3 4 4 3 5% 6% 53%	1800
	11th to 20th	Night	8% 4 2 6% 4 3 4 3 5% 8% 53%	1844
	21st to end	Night	9% 4 1 5% 3 3 3 3 4 7% 56%	1980
October	1st to 10th	Night	7% 4 2 4 3 4 3 2 5% 6% 60%	2088
	11th to 20th	Night	13% 5% 2 5% 3 2 4 2 4 6% 54%	2160
	21st to end	Night	18% 7% 2 5% 3 3 3 2 3 5% 47%	2412
November	1st to 10th	Night	11% 5% 2 5% 3 2 2 2 5% 6% 58%	2406
	11th to 20th	Night	13% 6% 2 5% 3 3 3 3 4 6% 52%	2470
	21st to end	Night	19% 7% 2 6% 3 3 3 2 3 4 48%	2470
December	1st to 10th	Night	18% 8% 2 5% 3 3 3 3 5% 8% 40%	2601
	11th to 20th	Night	16% 8% 3 6% 5% 4 4 3 4 5% 43%	3279
	21st to end	Night	17% 13% 4 8% 5% 4 4 3 4 5% 31%	4884

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 10% 28% 12% 2	2528
	11th to 20th	Day	42% 3 9% 26% 16% 3	2726
	21st to end	Day	54% 3 10% 19% 12% 3	3135
February	1st to 10th	Day	48% 3 12% 22% 14% 1	1785
	11th to 20th	Day	47% 3 11% 20% 14% 5%	1858
	21st to end	Day	48% 4 10% 21% 12% 5%	1570
March	1st to 10th	Day	52% 4 5% 19% 12% 7%	3120
	11th to 20th	Day	37% 4 10% 28% 16% 6%	3438
	21st to end	Day	42% 5% 15% 24% 14% 1	4087
April	1st to 10th	Day	36% 5% 11% 28% 18% 2	2280
	11th to 20th	Day	44% 3 11% 21% 16% 4	2254
	21st to end	Day	44% 5% 11% 24% 14% 1	2280
May	1st to 10th	Day	44% 8% 13% 23% 11% 1	3918
	11th to 20th	Day	43% 6% 12% 26% 12% 1	4139
	21st to end	Day	39% 7% 11% 22% 21% 1	4837
June	1st to 10th	Day	33% 7% 15% 25% 19% 2	2660
	11th to 20th	Day	29% 6% 12% 29% 22% 3	2660
	21st to end	Day	28% 8% 16% 26% 17% 5%	2660
July	1st to 10th	Day	35% 7% 13% 25% 16% 3	4371
	11th to 20th	Day	24% 8% 13% 35% 16% 2	4365
	21st to end	Day	42% 10% 14% 25% 9% 1	4434
August	1st to 10th	Day	32% 9% 14% 27% 17% 1	2340
	11th to 20th	Day	36% 7% 13% 27% 15% 2	2245
	21st to end	Day	30% 6% 15% 27% 17% 5%	2485
September	1st to 10th	Day	35% 6% 10% 27% 18% 4	2160
	11th to 20th	Day	33% 6% 10% 24% 26% 2	2098
	21st to end	Day	29% 4 8% 28% 27% 3	1980
October	1st to 10th	Day	27% 5% 10% 27% 27% 5%	1869
	11th to 20th	Day	35% 4 7% 26% 21% 7%	1800
	21st to end	Day	41% 4 6% 26% 18% 4	1942
November	1st to 10th	Day	32% 5% 9% 27% 21% 6%	1672
	11th to 20th	Day	39% 4 7% 23% 22% 5%	1710
	21st to end	Day	44% 4 7% 24% 19% 2	1710
December	1st to 10th	Day	43% 4 10% 26% 15% 2	1577
	11th to 20th	Day	47% 4 8% 24% 15% 2	1915
	21st to end	Day	56% 4 11% 16% 11% 2	2783
January	1st to 10th	Night	43% 4 10% 29% 13% 1	4428
	11th to 20th	Night	46% 7% 8% 24% 13% 2	4239
	21st to end	Night	51% 4 11% 23% 11% 1	4532
February	1st to 10th	Night	51% 3 8% 22% 13% 2	2394
	11th to 20th	Night	44% 3 9% 22% 18% 4	2219
	21st to end	Night	46% 4 10% 19% 16% 5%	1884
March	1st to 10th	Night	49% 4 8% 19% 15% 6%	3733
	11th to 20th	Night	35% 6% 11% 23% 19% 7%	3549
	21st to end	Night	41% 6% 12% 29% 11% 1	3544
April	1st to 10th	Night	34% 5% 11% 27% 19% 4	1900
	11th to 20th	Night	38% 5% 9% 23% 20% 5%	1875
	21st to end	Night	45% 5% 8% 25% 15% 3	1900
May	1st to 10th	Night	41% 6% 17% 24% 10% 1	3040
	11th to 20th	Night	41% 7% 13% 21% 17% 1	2757
	21st to end	Night	37% 8% 12% 24% 17% 2	2751
June	1st to 10th	Night	32% 7% 14% 25% 20% 3	1520
	11th to 20th	Night	23% 6% 12% 28% 24% 6%	1520
	21st to end	Night	21% 7% 18% 28% 18% 9%	1520
July	1st to 10th	Night	31% 7% 14% 28% 16% 4	2490
	11th to 20th	Night	24% 6% 11% 37% 18% 4	2482
	21st to end	Night	37% 8% 17% 24% 13% 1	2873
August	1st to 10th	Night	26% 8% 17% 31% 17% 2	1791
	11th to 20th	Night	29% 6% 14% 27% 22% 3	1876
	21st to end	Night	27% 5% 14% 29% 20% 5%	2080
September	1st to 10th	Night	32% 6% 7% 30% 19% 6%	1800
	11th to 20th	Night	30% 6% 9% 26% 25% 4	1844
	21st to end	Night	29% 5% 9% 22% 29% 6%	1980
October	1st to 10th	Night	26% 3 10% 26% 30% 6%	2088
	11th to 20th	Night	32% 4 7% 24% 26% 7%	2160
	21st to end	Night	40% 4 7% 24% 19% 6%	2412
November	1st to 10th	Night	29% 3 10% 27% 25% 6%	2406
	11th to 20th	Night	35% 3 7% 25% 23% 7%	2470
	21st to end	Night	42% 3 7% 24% 22% 2	2470
December	1st to 10th	Night	43% 4 12% 23% 15% 2	2601
	11th to 20th	Night	44% 4 9% 24% 18% 2	3281
	21st to end	Night	53% 6% 8% 19% 13% 2	4884

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% 11% 30% 24% 7%	270
	11th to 20th	Day	25% 15% 40% 17% 2 1	270
	21st to end	Day	20% 15% 37% 23% 4	297
February	1st to 10th	Day	25% 13% 41% 16% 6%	270
	11th to 20th	Day	23% 21% 34% 18% 4	270
	21st to end	Day	28% 18% 34% 16% 4	225
March	1st to 10th	Day	19% 16% 36% 21% 8%	270
	11th to 20th	Day	24% 17% 38% 17% 3 1	270
	21st to end	Day	24% 15% 32% 23% 7%	454
April	1st to 10th	Day	14% 15% 36% 25% 10% 1	460
	11th to 20th	Day	19% 18% 28% 21% 13% 1	452
	21st to end	Day	19% 12% 29% 28% 9% 2	460
May	1st to 10th	Day	16% 12% 30% 26% 12% 3	463
	11th to 20th	Day	17% 6% 25% 26% 17% 8%	515
	21st to end	Day	11% 6% 23% 33% 20% 8%	734
June	1st to 10th	Day	11% 4 19% 24% 27% 15%	680
	11th to 20th	Day	6% 1 16% 37% 27% 12%	680
	21st to end	Day	6% 3 22% 37% 22% 10%	680
July	1st to 10th	Day	10% 3 11% 27% 27% 22%	671
	11th to 20th	Day	6% 2 12% 33% 32% 15%	668
	21st to end	Day	8% 3 13% 31% 32% 14%	739
August	1st to 10th	Day	9% 2 9% 31% 33% 16%	572
	11th to 20th	Day	14% 3 15% 25% 29% 13%	479
	21st to end	Day	9% 2 7% 26% 38% 19%	532
September	1st to 10th	Day	10% 4 10% 28% 34% 16%	450
	11th to 20th	Day	7% 3 8% 28% 37% 18%	450
	21st to end	Day	12% 7% 15% 27% 27% 12%	450
October	1st to 10th	Day	10% 4 19% 38% 19% 9%	339
	11th to 20th	Day	17% 11% 33% 25% 13% 2	270
	21st to end	Day	25% 13% 28% 25% 9%	297
November	1st to 10th	Day	13% 10% 28% 30% 14% 4	270
	11th to 20th	Day	11% 17% 31% 24% 14% 2	270
	21st to end	Day	24% 11% 29% 24% 11% 1	270
December	1st to 10th	Day	16% 13% 33% 24% 11% 3	270
	11th to 20th	Day	23% 13% 31% 23% 10%	270
	21st to end	Day	24% 15% 39% 16% 5%	297
January	1st to 10th	Night	22% 13% 34% 26% 5%	950
	11th to 20th	Night	24% 14% 37% 21% 3	950
	21st to end	Night	20% 11% 39% 28% 2	1045
February	1st to 10th	Night	24% 14% 35% 24% 3	874
	11th to 20th	Night	21% 16% 35% 25% 3	743
	21st to end	Night	24% 13% 37% 23% 2	628
March	1st to 10th	Night	23% 13% 33% 27% 4	760
	11th to 20th	Night	20% 11% 33% 30% 6%	613
	21st to end	Night	23% 10% 29% 31% 7%	627
April	1st to 10th	Night	14% 11% 38% 31% 7%	570
	11th to 20th	Night	18% 10% 29% 30% 12% 1	563
	21st to end	Night	22% 6% 32% 30% 10% 1	570
May	1st to 10th	Night	16% 5% 28% 38% 12% 2	570
	11th to 20th	Night	16% 4 22% 38% 19% 1	561
	21st to end	Night	8% 3 18% 44% 23% 4	617
June	1st to 10th	Night	12% 3 13% 37% 32% 3	570
	11th to 20th	Night	4 2 11% 51% 30% 2	570
	21st to end	Night	4 2 15% 44% 33% 2	570
July	1st to 10th	Night	9% 2 8% 33% 39% 9%	555
	11th to 20th	Night	5% 3 8% 38% 39% 7%	552
	21st to end	Night	7% 3 10% 35% 40% 5%	624
August	1st to 10th	Night	6% 2 7% 39% 39% 6%	567
	11th to 20th	Night	8% 2 9% 38% 38% 4	564
	21st to end	Night	6% 2 7% 31% 47% 7%	624
September	1st to 10th	Night	12% 1 9% 34% 37% 6%	540
	11th to 20th	Night	9% 3 11% 31% 39% 7%	584
	21st to end	Night	11% 3 17% 34% 31% 4	720
October	1st to 10th	Night	8% 4 21% 38% 25% 4	720
	11th to 20th	Night	15% 7% 29% 32% 16% 2	720
	21st to end	Night	22% 7% 27% 32% 11% 1	792
November	1st to 10th	Night	14% 6% 29% 37% 14% 1	740
	11th to 20th	Night	17% 9% 33% 31% 11%	760
	21st to end	Night	23% 8% 29% 30% 10%	760
December	1st to 10th	Night	22% 10% 32% 29% 6%	891
	11th to 20th	Night	22% 9% 30% 31% 7% 1	950
	21st to end	Night	24% 11% 35% 26% 4	1045

Page generated at 2024-08-27 08:49:36. Version ac07

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