diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index 1e279249..f0de5d00 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -41,9 +41,11 @@ import { LoginComponent } from './login/login.component';
 import { NavbarComponent } from './navbar/navbar.component';
 import { PageNotFoundComponent } from './http-status/page-not-found/page-not-found.component';
 import { SidebarComponent } from './sidebar/sidebar.component';
-import { ThresholdComponent } from './charts/extra-params-components/threshold.component';
 import { WaveComponent } from './ng2-spin-kit/wave.component';
 
+import { ThresholdComponent,
+         PercentileComponent } from './charts/extra-params-components/';
+
 // App services
 import { ApiHttp } from './auth/api-http.service';
 import { apiHttpProvider } from './auth/api-http.provider';
@@ -69,6 +71,7 @@ const locationStrategyProvider = {
     AppComponent,
     WaveComponent,
     ThresholdComponent,
+    PercentileComponent,
     ChartComponent,
     DashboardComponent,
     IndicatorListComponent,
diff --git a/src/app/charts/chart.component.html b/src/app/charts/chart.component.html
index 39ad4141..ac2d0db7 100644
--- a/src/app/charts/chart.component.html
+++ b/src/app/charts/chart.component.html
@@ -7,9 +7,16 @@ <h2 class="chart-label">
     <ccl-threshold-parameters
         [indicator]="chart.indicator"
         [extraParams]="extraParams"
-        (thresholdParamSelected)="onThresholdSelected($event)">
+        (thresholdParamSelected)="onExtraParamsSelected($event)">
     </ccl-threshold-parameters>
 </div>
+<div *ngIf="isPercentileIndicator(chart.indicator.name)" class="chart-options">
+    <ccl-percentile-parameters
+        [indicator]="chart.indicator"
+        [extraParams]="extraParams"
+        (percentileParamSelected)="onExtraParamsSelected($event)">
+    </ccl-percentile-parameters>
+</div>
 <div class="chart-body">
     <sk-wave [isRunning]="!chartData || ! chartData.length"></sk-wave>
     <div class="chart-graphic" *ngIf="chartData && chartData.length">
diff --git a/src/app/charts/chart.component.ts b/src/app/charts/chart.component.ts
index a83c99cc..88cffdf4 100644
--- a/src/app/charts/chart.component.ts
+++ b/src/app/charts/chart.component.ts
@@ -27,7 +27,8 @@ import { IndicatorService } from '../services/indicator.service';
 import { DataExportService } from '../services/data-export.service';
 import { ImageExportService } from '../services/image-export.service';
 
-import { isThresholdIndicator } from '../charts/extra-params-components/extra-params.constants';
+import { isThresholdIndicator,
+         isPercentileIndicator } from '../charts/extra-params-components/extra-params.constants';
 
 import * as _ from 'lodash';
 
@@ -65,6 +66,7 @@ export class ChartComponent implements OnChanges, OnDestroy, AfterViewInit {
     private lastYear = 2100;
     public dateRange: number[] = [this.firstYear, this.lastYear];
     public isThresholdIndicator = isThresholdIndicator;
+    public isPercentileIndicator = isPercentileIndicator;
     public sliderConfig: any = {
         behaviour: 'drag',
         connect: true,
@@ -181,13 +183,19 @@ export class ChartComponent implements OnChanges, OnDestroy, AfterViewInit {
         this.imageExportService.downloadAsPNG(this.chart.indicator.name, fileName);
     }
 
-    public onThresholdSelected($event) {
+    public onExtraParamsSelected($event) {
         const thresholdParams = $event.data as ThresholdIndicatorQueryOpts;
         this.extraParams = thresholdParams;
         this.onExtraParamsChanged.emit(this.extraParams);
         this.updateChart(this.extraParams);
     }
 
+    public onPercentileSelected($event) {
+        const percentileParams = $event.data;
+        console.log(percentileParams);
+        this.updateChart(percentileParams);
+    }
+
     curlCommandCopied(copiedPopup) {
         // show a confirmation tooltip, then hide it again after a second
         copiedPopup.show();
diff --git a/src/app/charts/extra-params-components/extra-params.constants.ts b/src/app/charts/extra-params-components/extra-params.constants.ts
index b38d376d..2ec2252d 100644
--- a/src/app/charts/extra-params-components/extra-params.constants.ts
+++ b/src/app/charts/extra-params-components/extra-params.constants.ts
@@ -6,8 +6,14 @@ const thresholdIndicatorNames = [
     'precipitation_threshold'
 ];
 
+const percentileIndicatorNames = [
+    'percentile_high_temperature',
+    'percentile_low_temperature',
+    'percentile_precipitation'
+];
+
 // TODO: concat additional extra parameter names to this array for #203, #204, and #205
-const extraParamsIndicatorNames = thresholdIndicatorNames;
+const extraParamsIndicatorNames = [].concat(thresholdIndicatorNames, percentileIndicatorNames);
 
 export function isThresholdIndicator(indicatorName: string): boolean {
     for (const thresholdName of thresholdIndicatorNames) {
@@ -26,3 +32,12 @@ export function hasExtraParams(indicatorName: string): boolean {
     }
     return false;
 }
+
+export function isPercentileIndicator(indicatorName: string): boolean {
+    for (const percentileName of percentileIndicatorNames) {
+        if (indicatorName === percentileName) {
+            return true;
+        }
+    }
+    return false;
+}
diff --git a/src/app/charts/extra-params-components/index.ts b/src/app/charts/extra-params-components/index.ts
index e2d0f861..4e089c34 100644
--- a/src/app/charts/extra-params-components/index.ts
+++ b/src/app/charts/extra-params-components/index.ts
@@ -1 +1,2 @@
 export * from './threshold.component';
+export * from './percentile.component';
diff --git a/src/app/charts/extra-params-components/percentile.component.html b/src/app/charts/extra-params-components/percentile.component.html
new file mode 100644
index 00000000..797af1fe
--- /dev/null
+++ b/src/app/charts/extra-params-components/percentile.component.html
@@ -0,0 +1,10 @@
+<div class="chart-options-group percentile">
+    <form [formGroup]="percentileForm" novalidate>
+        <div class="chart-options-body form-group">
+            <span class="optional-parameters-label">Show {{indicator.label | lowercase}} at percentile
+                <input type="number"
+                        formControlName="percentileCtl">
+            of projections.</span>
+        </div>
+    </form>
+</div>
diff --git a/src/app/charts/extra-params-components/percentile.component.ts b/src/app/charts/extra-params-components/percentile.component.ts
new file mode 100644
index 00000000..8030cf6e
--- /dev/null
+++ b/src/app/charts/extra-params-components/percentile.component.ts
@@ -0,0 +1,55 @@
+import { AfterViewInit, Component, EventEmitter, Input, Output, OnInit } from '@angular/core';
+import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+
+import { Indicator } from '../../models/indicator.model';
+
+import * as _ from 'lodash';
+
+/*
+ * Percentile params component
+ * Uni-field form to allow user to specify the percentile params
+ */
+@Component({
+  selector: 'ccl-percentile-parameters',
+  templateUrl: './percentile.component.html'
+})
+export class PercentileComponent implements AfterViewInit, OnInit {
+
+    @Input() indicator: Indicator;
+    @Input() extraParams: any;
+
+    percentileForm: FormGroup;
+
+    // default form values
+    private defaultPercentile = 50;
+
+    @Output() percentileParamSelected = new EventEmitter<any>();
+
+    constructor(private formBuilder: FormBuilder) {}
+
+    ngOnInit() {
+        // must create form on init instead of constructor to capture @Input values
+        this.createForm();
+    }
+
+    ngAfterViewInit() {
+        // Since valueChanges triggers initially before parent is ready, wait until
+        // parent is ready here and trigger it to draw chart with extra parameters.
+        this.percentileParamSelected.emit({data: {
+            'percentile': this.percentileForm.controls.percentileCtl.value
+        }});
+    }
+
+    createForm() {
+        this.percentileForm = this.formBuilder.group({
+            percentileCtl: [this.extraParams.percentile || this.defaultPercentile, Validators.required]
+        });
+
+        this.percentileForm.valueChanges.debounceTime(700).subscribe(form => {
+            this.percentileParamSelected.emit({data: {
+                'event': event,
+                'percentile': form.percentileCtl
+            }});
+        });
+    }
+}
diff --git a/src/app/charts/extra-params-components/threshold.component.ts b/src/app/charts/extra-params-components/threshold.component.ts
index e017081d..6c11e0c4 100644
--- a/src/app/charts/extra-params-components/threshold.component.ts
+++ b/src/app/charts/extra-params-components/threshold.component.ts
@@ -6,8 +6,8 @@ import { Indicator } from '../../models/indicator.model';
 import * as _ from 'lodash';
 
 /*
- * Chart component
- * Container for each individual chart plus controls
+ * Threshold params component
+ * Multi-field form to allow user to specify threshold params
  */
 @Component({
   selector: 'ccl-threshold-parameters',
diff --git a/src/app/models/percentile-indicator-query-opts.model.ts b/src/app/models/percentile-indicator-query-opts.model.ts
new file mode 100644
index 00000000..b9a283bc
--- /dev/null
+++ b/src/app/models/percentile-indicator-query-opts.model.ts
@@ -0,0 +1,7 @@
+import { IndicatorQueryOpts } from './indicator-query-opts.model';
+
+export interface PercentileIndicatorQueryOpts extends IndicatorQueryOpts {
+    params: {
+        percentile: Number;
+    }
+}
diff --git a/src/app/services/indicator.service.ts b/src/app/services/indicator.service.ts
index f36fe0c0..9c510f96 100644
--- a/src/app/services/indicator.service.ts
+++ b/src/app/services/indicator.service.ts
@@ -6,11 +6,12 @@ import 'rxjs/Rx';
 
 import { Indicator } from '../models/indicator.model';
 import { IndicatorQueryOpts } from '../models/indicator-query-opts.model';
+import { PercentileIndicatorQueryOpts } from '../models/percentile-indicator-query-opts.model';
 import { ThresholdIndicatorQueryOpts } from '../models/threshold-indicator-query-opts.model';
 import { ApiHttp } from '../auth/api-http.service';
 import { apiHost } from '../constants';
 
-import { isThresholdIndicator } from '../charts/extra-params-components/extra-params.constants';
+import { isThresholdIndicator, isPercentileIndicator } from '../charts/extra-params-components/extra-params.constants';
 
 /*
  * Indicator Service
@@ -40,6 +41,15 @@ export class IndicatorService {
             searchParams.append('threshold_comparator', thresholdOpts.params.threshold_comparator);
         }
 
+        if (isPercentileIndicator(options.indicator.name)) {
+            const percentileOpts: PercentileIndicatorQueryOpts = <PercentileIndicatorQueryOpts> options;
+            // abort request if chart is in flux (these parameters are required)
+            if (!percentileOpts.params.percentile) {
+                return Observable.of({url: ''});
+            }
+            searchParams.append('percentile', percentileOpts.params.percentile.toString());
+        }
+
         if (options.params.years) {
             searchParams.append('years', options.params.years.join(','));
         }